diff --git a/reactos/dll/win32/advapi32/misc/logon.c b/reactos/dll/win32/advapi32/misc/logon.c
index 8dce3bf47ba..950b425824c 100644
--- a/reactos/dll/win32/advapi32/misc/logon.c
+++ b/reactos/dll/win32/advapi32/misc/logon.c
@@ -650,7 +650,7 @@ LogonUserW(LPWSTR lpszUsername,
     /* Get the user SID from the registry */
     if (!GetUserSid (lpszUsername, &UserSid))
     {
-        ERR("SamGetUserSid() failed\n");
+        ERR("GetUserSid() failed\n");
         return FALSE;
     }
 
diff --git a/reactos/dll/win32/advapi32/sec/sid.c b/reactos/dll/win32/advapi32/sec/sid.c
index c289010d199..1b950be8cde 100644
--- a/reactos/dll/win32/advapi32/sec/sid.c
+++ b/reactos/dll/win32/advapi32/sec/sid.c
@@ -678,7 +678,7 @@ ConvertSecurityDescriptorToStringSecurityDescriptorW(PSECURITY_DESCRIPTOR Securi
 
     if (SDRevision != SDDL_REVISION_1)
     {
-        ERR("Pogram requested unknown SDDL revision %d\n", SDRevision);
+        ERR("Program requested unknown SDDL revision %d\n", SDRevision);
         SetLastError(ERROR_UNKNOWN_REVISION);
         return FALSE;
     }
@@ -698,6 +698,9 @@ ConvertSecurityDescriptorToStringSecurityDescriptorW(PSECURITY_DESCRIPTOR Securi
             return FALSE;
 
     wstr = wptr = LocalAlloc(0, (len + 1)*sizeof(WCHAR));
+    if (wstr == NULL)
+        return FALSE;
+        
     if (SecurityInformation & OWNER_SECURITY_INFORMATION)
         if (!DumpOwner(SecurityDescriptor, &wptr, NULL))
             return FALSE;
@@ -740,6 +743,12 @@ ConvertSecurityDescriptorToStringSecurityDescriptorA(PSECURITY_DESCRIPTOR Securi
 
         lenA = WideCharToMultiByte(CP_ACP, 0, wstr, len, NULL, 0, NULL, NULL);
         *OutputString = HeapAlloc(GetProcessHeap(), 0, lenA);
+        if (*OutputString == NULL)
+        {
+            LocalFree(wstr);
+            *OutputLen = 0;
+            return FALSE;
+        }
         WideCharToMultiByte(CP_ACP, 0, wstr, len, *OutputString, lenA, NULL, NULL);
         LocalFree(wstr);
 
@@ -1786,6 +1795,8 @@ ConvertStringSidToSidA(IN LPCSTR StringSid,
     {
         UINT len = MultiByteToWideChar(CP_ACP, 0, StringSid, -1, NULL, 0);
         LPWSTR wStringSid = HeapAlloc(GetProcessHeap(), 0, len * sizeof(WCHAR));
+        if (wStringSid == NULL)
+            return FALSE;
         MultiByteToWideChar(CP_ACP, 0, StringSid, - 1, wStringSid, len);
         bRetVal = ConvertStringSidToSidW(wStringSid, sid);
         HeapFree(GetProcessHeap(), 0, wStringSid);
diff --git a/reactos/dll/win32/avicap32/avicap32.c b/reactos/dll/win32/avicap32/avicap32.c
index cb6a94bbc9c..276aaf9c8a1 100644
--- a/reactos/dll/win32/avicap32/avicap32.c
+++ b/reactos/dll/win32/avicap32/avicap32.c
@@ -218,21 +218,24 @@ capGetDriverDescriptionW(WORD wDriverIndex,
                         if (dwInfoSize)
                         {
                             Version = HeapAlloc(GetProcessHeap(), 0, dwInfoSize);
-
-                            GetFileVersionInfo(szFileName, 0, dwInfoSize, Version);
-
-                            if (VerQueryValueW(Version, L"\\", &Ms, &Ls))
+                            
+                            if (Version != NULL)
                             {
-                                memmove(&FileInfo, Ms, Ls);
-                                swprintf(szVersion, L"Version: %d.%d.%d.%d",
-                                         HIWORD(FileInfo.dwFileVersionMS),
-                                         LOWORD(FileInfo.dwFileVersionMS),
-                                         HIWORD(FileInfo.dwFileVersionLS),
-                                         LOWORD(FileInfo.dwFileVersionLS));
+                                GetFileVersionInfo(szFileName, 0, dwInfoSize, Version);
 
-                                lstrcpynW(lpszVer, szVersion, cbVer);
+                                if (VerQueryValueW(Version, L"\\", &Ms, &Ls))
+                                {
+                                    memmove(&FileInfo, Ms, Ls);
+                                    swprintf(szVersion, L"Version: %d.%d.%d.%d",
+                                             HIWORD(FileInfo.dwFileVersionMS),
+                                             LOWORD(FileInfo.dwFileVersionMS),
+                                             HIWORD(FileInfo.dwFileVersionLS),
+                                             LOWORD(FileInfo.dwFileVersionLS));
+
+                                    lstrcpynW(lpszVer, szVersion, cbVer);
+                                }
+                                HeapFree(GetProcessHeap(), 0, Version);
                             }
-                            HeapFree(GetProcessHeap(), 0, Version);
                         }
                     }