>I am trying to use Arto Toikka's screen re-sizer, ATResizer ver 2.7a. The forms work well in XP but an error comes when using in Vista.
>This error is Error:1705, File access denied c:\windows\atrezer.mem. Can anyone help please !! TIA

I haven't tried this class, but it sounds like it tries to write some mem file in Windows folder. Can you change this piece of code to write into your application directory instead? You can not write to Windows folder under Vista.