The other day my mate was using my pc and when he had finished and gone i looked at the desktop and noticed all the icons had changed to the unknown file icon like windows dosn't know what the program is but they still all work fine it's just the icons that have changed and it's happend in the start menu aswell, i've tried manually changing the icons back but when i select the original icons again the same thing comes up, i've added a screen shot of my desktop to show what i mean please can anybody help?
start by right clicking the desktop then click Properties > Appearance Tab > Effects and then make sure that "Use Large Icons" is UNchecked.
reboot.
if that doesnt work then right click desktop > properties > desktop > customise desktop then under the icons choose restore defaults. you might have to do this one by one for each shortcut.