Page 1 of screen problem

Last night my pc was running ok and the screen was great,but today.
The displat shows everything in 16 colours and 640x480 rather than 800x600.
Tryed to change the screen size but aftrer i apply it says use restart the computer for it take effect.
So i done this and still the screen size is wrong.check for viruses and everything seem to be ok ,but i`m loss and even now this web page look like a old c64 back in the 80`s .
Can anyone help

I`ve fixed this problem on 3 PCs in the past few years. I fixed it by uninstalling the video card in Device Manager and then rebooting - everything was back to normal (drivers reinstalled automatically)

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