Well done. The cleaning is on old trick I learned on the PS2.
Anyway, you only took two cards out. So put the Video card in first and get the worst over with. What should happen is that it will detect the card and ask for drivers. If Windows doesn't find them and you don't have them, get them from the web- but you need to know the exact make and model of your video card.
Re-boot and run the PC without the modem card doing stuff with the display settings you would normally have.
I expect this to work because something happened to take your system out of a state of grace when it was previously stable. The re-install would have done the trick, fortunately.
Huh - a dirty XP disk!
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Posting Virtuoso
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since Aug 2007