Click on windows explorer, c:\, Documents and Settings, Your User Name, Tehn
click on view ( top of screen), options, then click on view in the box that
come up, check mark "Show Hidden Files And Folders".
Now F5, look for a folder called Local Settings (under your user name).
Open it and delete everything in the temp folder, then do the same (delete)
for the temporary internet files under and delete all that's in there. No
try to run the disk clean up again.