Today when I started to computer the icons were at least 3X the size they usually are and the graphics on my wallpaper and online where very grainy.  I did GET an error message on startup (once out of the 3 times I RESTARTED).  It was "there is a problem with your display settings.  The adapter type is incorrect or the current settings do not work with your hardware".   I reset the display settings and it helped a bit, but things still aren't great.   I have no idea what this means.  I would appreciate any suggestions.Videocard drivers need reinstalling.

How have they become corrupted? What have you done?This is probably a stupid question, but how do I do that?  I checked for UPDATES on the Microsoft site and there were no current updates available.Remove the video CARD from your device manager.

Right click My Computer>Properties>Hardware>Device Manager.

Re-boot & allow Windows to detect your video card & install the drivers for you.

If you feel adventurous you can also download & install the latest drivers from the manufacturer's website. Quote

Remove the video card from your device manager.

Right click My Computer>Properties>Hardware>Device Manager.

Re-boot & allow Windows to detect your video card & install the drivers for you.

If you feel adventurous you can also download & install the latest drivers from the manufacturer's website.