Index: reactos/dll/win32/advpack/advpack.c
===================================================================
--- reactos/dll/win32/advpack/advpack.c	(revision 72944)
+++ reactos/dll/win32/advpack/advpack.c	(working copy)
@@ -899,7 +899,7 @@
 {
     HKEY setup, guid;
     WCHAR stub[MAX_PATH];
-    DWORD size = MAX_PATH;
+    DWORD size = sizeof(stub);
     HRESULT hr = S_OK;
     BOOL res;
 
Index: reactos/dll/win32/mscoree/metahost.c
===================================================================
--- reactos/dll/win32/mscoree/metahost.c	(revision 72944)
+++ reactos/dll/win32/mscoree/metahost.c	(working copy)
@@ -377,7 +377,7 @@
     if (RegOpenKeyExW(HKEY_LOCAL_MACHINE, dotnet_key, 0, KEY_READ, &key))
         return FALSE;
 
-    len = MAX_PATH;
+    len = MAX_PATH * sizeof(WCHAR);
     if (RegQueryValueExW(key, install_root, 0, NULL, (LPBYTE)install_dir, &len))
     {
         RegCloseKey(key);
Index: reactos/dll/win32/shell32/wine/shellpath.c
===================================================================
--- reactos/dll/win32/shell32/wine/shellpath.c	(revision 72944)
+++ reactos/dll/win32/shell32/wine/shellpath.c	(working copy)
@@ -1375,7 +1375,7 @@
     HRESULT hr;
     WCHAR shellFolderPath[MAX_PATH], userShellFolderPath[MAX_PATH];
     LPCWSTR pShellFolderPath, pUserShellFolderPath;
-    DWORD dwType, dwPathLen = MAX_PATH;
+    DWORD dwType, dwPathLen = MAX_PATH * sizeof(WCHAR);
     HKEY userShellFolderKey, shellFolderKey;
 
     TRACE("%p,%s,%s,%p\n",rootKey, debugstr_w(userPrefix), debugstr_w(value),
Index: reactos/dll/win32/shlwapi/ordinal.c
===================================================================
--- reactos/dll/win32/shlwapi/ordinal.c	(revision 72944)
+++ reactos/dll/win32/shlwapi/ordinal.c	(working copy)
@@ -4058,7 +4058,7 @@
  */
 HRESULT WINAPI SHLoadRegUIStringW(HKEY hkey, LPCWSTR value, LPWSTR buf, DWORD size)
 {
-    DWORD type, sz = size;
+    DWORD type, sz = size * sizeof(WCHAR);
 
     if(RegQueryValueExW(hkey, value, NULL, &type, (LPBYTE)buf, &sz) != ERROR_SUCCESS)
         return E_FAIL;