Please delete your temporary files. Double Click My Computer (WinXP: Navigate to Start --->My Computer)
You will see an icon representing your harddrive (most likely C: Drive) Right Click on the hard drive icon and click Properties at the
bottom of the fly out window. One the very first tab (General) you will see a button labeled "Disk Cleanup"...click that button.
Make sure the following are checked:
Downloaded Program Files
Temporary Internet Files and
Recycle Bin
Click OK and Disk Cleanup will delete those files for you.

Reboot your PC.