diff --git a/ba/ba1700.cpp b/ba/ba1700.cpp
index 7a254f914..53f26103b 100755
--- a/ba/ba1700.cpp
+++ b/ba/ba1700.cpp
@@ -573,7 +573,7 @@ bool TInstaller_mask::move_file(const TFilename& src, const TFilename& dst) cons
 {
   TFilename dest = dst;
   const int reboot = needs_reboot(dest);
-  if (reboot > NEW_MENU)
+  if (reboot > NEW_MENU && dst.exist())
   {
     dest.rtrim(1);
     dest << '_';
@@ -588,7 +588,7 @@ bool TInstaller_mask::move_file(const TFilename& src, const TFilename& dst) cons
     {
       subdir.add(dirs.get(c));
       if (subdir.right(1) == ":" )
-        subdir << '\\';
+        subdir << SLASH;
       if (!subdir.exist() )
         // build destination directory
         make_dir(subdir);
@@ -943,7 +943,7 @@ bool TInstaller_mask::install(const TString& module, int patchlevel)
               src = path;
               src.add(dst);
               const int reboot = needs_reboot(dst);
-              if (reboot > NEW_MENU)
+              if (reboot > NEW_MENU && dst.exist())
               {
                 dst.rtrim(1);
                 dst << '_';