You can go to START>Programs>Accessories>System Tools>Disk Cleanup and let it run through to see if you can recover anything. Then, you can go to Disk Cleanup again, and this time, move over to the "more optoins" tab, which you can see here:
http://www.theeldergeek.com/images/Disk Cleanup Utility/Disk Cleanup 04.gif
and cleanup those files too if any are present.