Thanks, I"ll do that... Also, I learned Windows adds a folder, file in Prefetch - I deleted that as well - thought that might be telling pc to change resolution when I opened it but no change. I don't get it - at the last moment its like the screen goes to16 colors or something like that ...just a rainbow of random color - the image, details still sort of visible. Windows scan says files are ok ... I tried disabling nvidia stuff [antialias,etc] or setting each to 'use applic choices' ... over ten days of tinkering. I just don't get it...but thanks, very much for offering your time and help.