diff --git a/reactos/dll/win32/setupapi/devinst.c b/reactos/dll/win32/setupapi/devinst.c
index 0057ef88419..ac40dbd0344 100644
--- a/reactos/dll/win32/setupapi/devinst.c
+++ b/reactos/dll/win32/setupapi/devinst.c
@@ -23,8 +23,6 @@
 
 /* Unicode constants */
 static const WCHAR BackSlash[] = {'\\',0};
-static const WCHAR ClassGUID[]  = {'C','l','a','s','s','G','U','I','D',0};
-static const WCHAR Class[]  = {'C','l','a','s','s',0};
 static const WCHAR DateFormat[]  = {'%','u','-','%','u','-','%','u',0};
 static const WCHAR DotCoInstallers[]  = {'.','C','o','I','n','s','t','a','l','l','e','r','s',0};
 static const WCHAR DotHW[]  = {'.','H','W',0};
@@ -459,21 +457,16 @@ SetupDiGetActualSectionToInstallExW(
             if (CurrentPlatform.cbSize != sizeof(SP_ALTPLATFORM_INFO))
             {
                 /* That's the first time we go here. We need to fill in the structure */
-                OSVERSIONINFOEX VersionInfo;
                 SYSTEM_INFO SystemInfo;
-                VersionInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
-                ret = GetVersionExW((OSVERSIONINFO*)&VersionInfo);
-                if (!ret)
-                    goto done;
                 GetSystemInfo(&SystemInfo);
                 CurrentPlatform.cbSize = sizeof(SP_ALTPLATFORM_INFO);
-                CurrentPlatform.Platform = VersionInfo.dwPlatformId;
-                CurrentPlatform.MajorVersion = VersionInfo.dwMajorVersion;
-                CurrentPlatform.MinorVersion = VersionInfo.dwMinorVersion;
+                CurrentPlatform.Platform = OsVersionInfo.dwPlatformId;
+                CurrentPlatform.MajorVersion = OsVersionInfo.dwMajorVersion;
+                CurrentPlatform.MinorVersion = OsVersionInfo.dwMinorVersion;
                 CurrentPlatform.ProcessorArchitecture = SystemInfo.wProcessorArchitecture;
                 CurrentPlatform.Reserved = 0;
-                CurrentProductType = VersionInfo.wProductType;
-                CurrentSuiteMask = VersionInfo.wSuiteMask;
+                CurrentProductType = OsVersionInfo.wProductType;
+                CurrentSuiteMask = OsVersionInfo.wSuiteMask;
             }
             ProductType = CurrentProductType;
             SuiteMask = CurrentSuiteMask;
@@ -489,6 +482,7 @@ SetupDiGetActualSectionToInstallExW(
         CallbackInfo.BestScore4 = ULONG_MAX;
         CallbackInfo.BestScore5 = ULONG_MAX;
         strcpyW(CallbackInfo.BestSection, InfSectionName);
+        TRACE("EnumerateSectionsStartingWith(InfSectionName = %S)\n", InfSectionName);
         if (!EnumerateSectionsStartingWith(
             InfHandle,
             InfSectionName,
@@ -498,6 +492,7 @@ SetupDiGetActualSectionToInstallExW(
             SetLastError(ERROR_GEN_FAILURE);
             goto done;
         }
+        TRACE("CallbackInfo.BestSection = %S\n", CallbackInfo.BestSection);
 
         dwFullLength = lstrlenW(CallbackInfo.BestSection);
         if (RequiredSize != NULL)
@@ -1011,7 +1006,7 @@ BOOL WINAPI SetupDiClassGuidsFromNameExW(
 
             dwLength = MAX_CLASS_NAME_LEN * sizeof(WCHAR);
             if (!RegQueryValueExW(hClassKey,
-                                  Class,
+                                  REGSTR_VAL_CLASS,
                                   NULL,
                                   NULL,
                                   (LPBYTE)szClassName,
@@ -1163,7 +1158,7 @@ BOOL WINAPI SetupDiClassNameFromGuidExW(
         return FALSE;
 
     /* Retrieve the class name data and close the key */
-    rc = QueryRegistryValue(hKey, Class, (LPBYTE *) &Buffer, &dwRegType, &dwLength);
+    rc = QueryRegistryValue(hKey, REGSTR_VAL_CLASS, (LPBYTE *) &Buffer, &dwRegType, &dwLength);
     RegCloseKey(hKey);
 
     /* Make sure we got the data */
@@ -3613,7 +3608,7 @@ HKEY SETUP_CreateClassKey(HINF hInf)
     if (!SetupGetLineTextW(NULL,
                            hInf,
                            Version,
-                           ClassGUID,
+                           REGSTR_VAL_CLASSGUID,
                            Buffer,
                            MAX_PATH,
                            &RequiredSize))
@@ -3634,7 +3629,7 @@ HKEY SETUP_CreateClassKey(HINF hInf)
         if (!SetupGetLineTextW(NULL,
                                hInf,
                                Version,
-                               Class,
+                               REGSTR_VAL_CLASS,
                                Buffer,
                                MAX_PATH,
                                &RequiredSize))
@@ -3657,7 +3652,7 @@ HKEY SETUP_CreateClassKey(HINF hInf)
     }
 
     if (RegSetValueExW(hClassKey,
-                       Class,
+                       REGSTR_VAL_CLASS,
                        0,
                        REG_SZ,
                        (LPBYTE)Buffer,
diff --git a/reactos/dll/win32/setupapi/install.c b/reactos/dll/win32/setupapi/install.c
index 8408cb6a84e..34c22daf94f 100644
--- a/reactos/dll/win32/setupapi/install.c
+++ b/reactos/dll/win32/setupapi/install.c
@@ -1459,25 +1459,25 @@ BOOL WINAPI SetupInstallFromInfSectionW( HWND owner, HINF hinf, PCWSTR section,
  */
 void WINAPI InstallHinfSectionW( HWND hwnd, HINSTANCE handle, LPCWSTR cmdline, INT show )
 {
+    BOOL ret = FALSE;
     WCHAR *s, *path, section[MAX_PATH];
     void *callback_context = NULL;
     DWORD SectionNameLength;
     UINT mode;
     HINF hinf = INVALID_HANDLE_VALUE;
     BOOL bRebootRequired = FALSE;
-    BOOL ret;
 
     TRACE("hwnd %p, handle %p, cmdline %s\n", hwnd, handle, debugstr_w(cmdline));
 
     lstrcpynW( section, cmdline, MAX_PATH );
 
-    if (!(s = strchrW( section, ' ' ))) return;
+    if (!(s = strchrW( section, ' ' ))) goto cleanup;
     *s++ = 0;
     while (*s == ' ') s++;
     mode = atoiW( s );
 
     /* quoted paths are not allowed on native, the rest of the command line is taken as the path */
-    if (!(s = strchrW( s, ' ' ))) return;
+    if (!(s = strchrW( s, ' ' ))) goto cleanup;
     while (*s == ' ') s++;
     path = s;
 
@@ -1576,6 +1576,12 @@ cleanup:
         SetupTermDefaultQueueCallback( callback_context );
     if ( hinf != INVALID_HANDLE_VALUE )
         SetupCloseInfFile( hinf );
+
+    // TODO: Localize the error string.
+    if (!ret && !(GlobalSetupFlags & PSPGF_NONINTERACTIVE))
+    {
+        MessageBoxW(hwnd, section, L"setupapi.dll: An error happened...", MB_ICONERROR | MB_OK);
+    }
 }
 
 
diff --git a/reactos/dll/win32/setupapi/misc.c b/reactos/dll/win32/setupapi/misc.c
index 626dc1305ae..701af294924 100644
--- a/reactos/dll/win32/setupapi/misc.c
+++ b/reactos/dll/win32/setupapi/misc.c
@@ -838,26 +838,38 @@ DWORD WINAPI RetreiveFileSecurity(LPCWSTR lpFileName,
 }
 
 
-static DWORD global_flags = 0;  /* FIXME: what should be in here? */
+/*
+ * See: https://msdn.microsoft.com/en-us/library/bb432397(v=vs.85).aspx
+ * for more information.
+ */
+DWORD GlobalSetupFlags = 0;
 
 /***********************************************************************
  *		pSetupGetGlobalFlags  (SETUPAPI.@)
  */
 DWORD WINAPI pSetupGetGlobalFlags(void)
 {
-    FIXME( "stub\n" );
-    return global_flags;
+    return GlobalSetupFlags;
 }
 
+/***********************************************************************
+ *		pSetupModifyGlobalFlags  (SETUPAPI.@)
+ */
+void WINAPI pSetupModifyGlobalFlags( DWORD mask, DWORD flags )
+{
+    FIXME( "stub\n" );
+    GlobalSetupFlags = (GlobalSetupFlags & ~mask) | (flags & mask);
+}
 
 /***********************************************************************
  *		pSetupSetGlobalFlags  (SETUPAPI.@)
  */
 void WINAPI pSetupSetGlobalFlags( DWORD flags )
 {
-    global_flags = flags;
+    pSetupModifyGlobalFlags(0xFFFFFFFF, flags);
 }
 
+
 /***********************************************************************
  *              AssertFail  (SETUPAPI.@)
  *
diff --git a/reactos/dll/win32/setupapi/parser.c b/reactos/dll/win32/setupapi/parser.c
index 6d5b23ca7d7..fbb459f8838 100644
--- a/reactos/dll/win32/setupapi/parser.c
+++ b/reactos/dll/win32/setupapi/parser.c
@@ -2383,10 +2383,12 @@ BOOL EnumerateSectionsStartingWith(
     unsigned int i;
 
     for (i = 0; i < file->nb_sections; i++)
+    {
         if (strncmpiW(pStr, file->sections[i]->name, len) == 0)
         {
             if (!Callback(file->sections[i]->name, Context))
                 return FALSE;
         }
+    }
     return TRUE;
 }
diff --git a/reactos/dll/win32/setupapi/setupapi.spec b/reactos/dll/win32/setupapi/setupapi.spec
index 13e6eb35b2b..7de1d290d75 100644
--- a/reactos/dll/win32/setupapi/setupapi.spec
+++ b/reactos/dll/win32/setupapi/setupapi.spec
@@ -569,7 +569,7 @@
 @ stdcall pSetupIsUserAdmin()
 @ stub pSetupMakeSurePathExists
 @ stub pSetupMalloc
-@ stub pSetupModifyGlobalFlags
+@ stdcall pSetupModifyGlobalFlags(long long)
 @ stdcall pSetupMultiByteToUnicode(str long)
 @ stdcall pSetupOpenAndMapFileForRead(wstr ptr ptr ptr ptr)
 @ stub pSetupOutOfMemory
diff --git a/reactos/dll/win32/setupapi/setupapi_private.h b/reactos/dll/win32/setupapi/setupapi_private.h
index cf86101583e..29594eb169e 100644
--- a/reactos/dll/win32/setupapi/setupapi_private.h
+++ b/reactos/dll/win32/setupapi/setupapi_private.h
@@ -281,7 +281,15 @@ UINT CALLBACK QUEUE_callback_WtoA( void *context, UINT notification, UINT_PTR, U
 #define _S_IREAD  0x0100
 
 extern HINSTANCE hInstance;
-extern OSVERSIONINFOW OsVersionInfo;
+extern OSVERSIONINFOEXW OsVersionInfo;
+
+/*
+ * See: https://msdn.microsoft.com/en-us/library/bb432397(v=vs.85).aspx
+ * for more information.
+ */
+extern DWORD GlobalSetupFlags;
+#define PSPGF_NO_BACKUP         0x0002
+#define PSPGF_NONINTERACTIVE    0x0004
 
 /* devinst.c */
 
diff --git a/reactos/dll/win32/setupapi/setupcab.c b/reactos/dll/win32/setupapi/setupcab.c
index e2f03039185..42f6192c224 100644
--- a/reactos/dll/win32/setupapi/setupcab.c
+++ b/reactos/dll/win32/setupapi/setupcab.c
@@ -29,10 +29,10 @@
 #include <share.h>
 #include <fdi.h>
 
-HINSTANCE hInstance = 0;
-OSVERSIONINFOW OsVersionInfo;
+HINSTANCE hInstance = NULL;
+OSVERSIONINFOEXW OsVersionInfo;
 
-static HINSTANCE CABINET_hInstance = 0;
+static HINSTANCE CABINET_hInstance = NULL;
 
 static HFDI (__cdecl *sc_FDICreate)(PFNALLOC, PFNFREE, PFNOPEN,
                 PFNREAD, PFNWRITE, PFNCLOSE, PFNSEEK, int, PERF);
@@ -652,8 +652,8 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
     switch (fdwReason) {
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls(hinstDLL);
-        OsVersionInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFOW);
-        if (!GetVersionExW(&OsVersionInfo))
+        OsVersionInfo.dwOSVersionInfoSize = sizeof(OsVersionInfo);
+        if (!GetVersionExW((POSVERSIONINFOW)&OsVersionInfo))
             return FALSE;
         hInstance = (HINSTANCE)hinstDLL;
         break;