diff --git a/reactos/dll/win32/advapi32/misc/shutdown.c b/reactos/dll/win32/advapi32/misc/shutdown.c
index 494c7aaaf31..0d7411fbe07 100644
--- a/reactos/dll/win32/advapi32/misc/shutdown.c
+++ b/reactos/dll/win32/advapi32/misc/shutdown.c
@@ -109,6 +109,9 @@ InitiateSystemShutdownA(LPSTR lpMachineName,
     INT         LastError;
     BOOL        rv;
 
+	MachineNameW.Buffer = NULL;
+	MessageW.Buffer = NULL;
+
     if (lpMachineName)
     {
         RtlInitAnsiString(&MachineNameA, lpMachineName);
@@ -126,7 +129,7 @@ InitiateSystemShutdownA(LPSTR lpMachineName,
         Status = RtlAnsiStringToUnicodeString(&MessageW, &MessageA, TRUE);
         if (STATUS_SUCCESS != Status)
         {
-            if (MachineNameW.Length)
+            if (MachineNameW.Buffer)
             {
                 RtlFreeUnicodeString(&MachineNameW);
             }
diff --git a/reactos/dll/win32/advapi32/reg/reg.c b/reactos/dll/win32/advapi32/reg/reg.c
index 171d9b0b453..f0180712742 100644
--- a/reactos/dll/win32/advapi32/reg/reg.c
+++ b/reactos/dll/win32/advapi32/reg/reg.c
@@ -917,6 +917,8 @@ CreateNestedKey(PHKEY KeyHandle,
   LocalObjectAttributes.ObjectName = &LocalKeyName;
   FullNameLength = LocalKeyName.Length / sizeof(WCHAR);
 
+  LocalKeyHandle = NULL;
+
   /* Remove the last part of the key name and try to create the key again. */
   while (Status == STATUS_OBJECT_NAME_NOT_FOUND)
     {
@@ -949,7 +951,8 @@ CreateNestedKey(PHKEY KeyHandle,
   Length = wcslen (LocalKeyName.Buffer);
   while (TRUE)
     {
-      NtClose (LocalKeyHandle);
+      if (LocalKeyHandle)
+	NtClose (LocalKeyHandle);
 
       LocalKeyName.Buffer[Length] = L'\\';
       Length = wcslen (LocalKeyName.Buffer);
@@ -2544,7 +2547,7 @@ RegEnumKeyExA (HKEY hKey,
 		}
 	}
 
-	TRACE("Key Namea0 Length %d\n", StringU.Length);
+	/*TRACE("Key Namea0 Length %d\n", StringU.Length);*/ /* BUGBUG could be uninitialized */
 	TRACE("Key Namea1 Length %d\n", NameLength);
 	TRACE("Key Namea Length %d\n", *lpcbName);
 	TRACE("Key Namea %s\n", lpName);
@@ -4685,13 +4688,14 @@ RegSetValueExA (HKEY hKey,
     {
       RtlCreateUnicodeStringFromAsciiz (&ValueName,
 					(PSTR)lpValueName);
-      pValueName = (LPWSTR)ValueName.Buffer;
     }
   else
     {
-      pValueName = NULL;
+      ValueName.Buffer = NULL;
     }
 
+  pValueName = (LPWSTR)ValueName.Buffer;
+
   if (((dwType == REG_SZ) ||
        (dwType == REG_MULTI_SZ) ||
        (dwType == REG_EXPAND_SZ)) &&
diff --git a/reactos/dll/win32/advapi32/sec/misc.c b/reactos/dll/win32/advapi32/sec/misc.c
index 5a5962a65b4..d85890c99ba 100644
--- a/reactos/dll/win32/advapi32/sec/misc.c
+++ b/reactos/dll/win32/advapi32/sec/misc.c
@@ -1252,6 +1252,8 @@ LookupPrivilegeValueA(LPCSTR lpSystemName,
         RtlCreateUnicodeStringFromAsciiz(&SystemName,
                                          (LPSTR)lpSystemName);
     }
+	else
+		SystemName.Buffer = NULL;
 
     /* Check the privilege name is not NULL */
     if (lpName == NULL)
@@ -1263,14 +1265,14 @@ LookupPrivilegeValueA(LPCSTR lpSystemName,
     RtlCreateUnicodeStringFromAsciiz(&Name,
                                      (LPSTR)lpName);
 
-    Result = LookupPrivilegeValueW((lpSystemName != NULL) ? SystemName.Buffer : NULL,
+    Result = LookupPrivilegeValueW(SystemName.Buffer,
                                    Name.Buffer,
                                    lpLuid);
 
     RtlFreeUnicodeString(&Name);
 
     /* Remote system? */
-    if (lpSystemName != NULL)
+    if (SystemName.Buffer != NULL)
     {
         RtlFreeUnicodeString(&SystemName);
     }
diff --git a/reactos/dll/win32/advapi32/service/eventlog.c b/reactos/dll/win32/advapi32/service/eventlog.c
index 66e4451ff0a..78c1cc64e81 100644
--- a/reactos/dll/win32/advapi32/service/eventlog.c
+++ b/reactos/dll/win32/advapi32/service/eventlog.c
@@ -872,7 +872,7 @@ ReportEventA(IN HANDLE hEventLog,
 
     HeapFree(GetProcessHeap(),
              0,
-             wideStrArray);
+             (PVOID)wideStrArray);
 
     return ret;
 }