diff --git a/reactos/lib/rtl/nls.c b/reactos/lib/rtl/nls.c
index 131587ddbc3..697835dd697 100644
--- a/reactos/lib/rtl/nls.c
+++ b/reactos/lib/rtl/nls.c
@@ -226,9 +226,9 @@ RtlInitNlsTables(IN PUSHORT AnsiTableBase,
  */
 NTSTATUS NTAPI
 RtlMultiByteToUnicodeN(
-   IN PWCHAR UnicodeString,
+   OUT PWCHAR UnicodeString,
    IN ULONG UnicodeSize,
-   IN PULONG ResultSize,
+   OUT PULONG ResultSize,
    IN PCSTR MbString,
    IN ULONG MbSize)
 {
@@ -286,7 +286,7 @@ RtlMultiByteToUnicodeN(
          *ResultSize = i * sizeof(WCHAR);
    }
 
-   return(STATUS_SUCCESS);
+   return STATUS_SUCCESS;
 }
 
 
diff --git a/reactos/lib/rtl/unicode.c b/reactos/lib/rtl/unicode.c
index e0b8a4f9741..619bba633a8 100644
--- a/reactos/lib/rtl/unicode.c
+++ b/reactos/lib/rtl/unicode.c
@@ -33,13 +33,23 @@ extern USHORT NlsUnicodeDefaultChar;
 */
 WCHAR
 NTAPI
-RtlAnsiCharToUnicodeChar(IN PUCHAR *AnsiChar)
+RtlAnsiCharToUnicodeChar(IN OUT PUCHAR *AnsiChar)
 {
     ULONG Size;
     NTSTATUS Status;
     WCHAR UnicodeChar = L' ';
 
-    Size = (NlsLeadByteInfo[**AnsiChar] == 0) ? 1 : 2;
+    PAGED_CODE_RTL();
+
+    if (NlsLeadByteInfo)
+    {
+        Size = (NlsLeadByteInfo[**AnsiChar] == 0) ? 1 : 2;
+    }
+    else
+    {
+        DPRINT1("HACK::Shouldn't have happened! Consider fixing Usetup and registry entries it creates on install\n");
+        Size = 1;
+    }
 
     Status = RtlMultiByteToUnicodeN(&UnicodeChar,
                                     sizeof(WCHAR),