Everything just got a whole lot bigger

[clueless2]

So I was doing my driver updates and as per usual, some of them required me to reboot before they took effect. No idea which driver I was updateing (I was just doing what the programme told me to do) but when it rebooted everything was huge. The icons on my desktop now take up the full page, squeezing the messenger into such a squish that the picture has disappeared. And when I open forum pages, or word documents or whatever, they are enormous.

When I go to use the Games section, the Solitaire game tells me I have lost a video card driver. But I can not find out what video card I was supposed to be using or where it went.

Any suggestions??

For clarity, the actual message is as follows:
Hardware acceleration is either disabled or not supported by your video card driver ... Make sure you have the latest videocard driver installed and that hardware acceleration is turned on.