Clipper, Vista and side effects

My first customer installed Vista (Basic) and did not agree to run a 
programm (clipper 5.3b) in a window.
To enable full screen mode I've installed standard video driver and now 
I have following problems:
- default refresh rate is too low and CRT monitor blinks while working
   with windows programms. Is it possible to change this rate?
- program hangs after:
   ? chr(7)    //bell
   msetcursor(.t.)

Has anyone experienced other problems?

Those effects are not present on my home's vista with original video 
driver (and text screens in a window only).

Another way to work in full screen is installing XP version of video 
driver but i've read it could cause unstability. Has someone tried it?