Windows Text size problem

I recently upgraded my Toshiba laptop with Windows XP Home
edition and the TEXT SIZE cannot be adjusted. For example
if I have my screen resolution set to either 800 x 640 or
1024 by 768 pixels the desk top looks fine.

However, when I want to run McAfee for example the screen
text size is too large and the entire image does NOT fit
within the window and I cannot reduce the font size.

Any ideas or help, please email to LennyL@LJLSeminars.com

Thanks,