cmed
Temp files are created by programs for added work space and also by programs that need to update after restart. In 99% of cases the file can be deleted safely. Go to start search and type in *.tmp and select all and delete all found. Now navigate to the windows\Temp folder and locate all files older then current date and delete those. Check inside all folders if present for old stuff to delete. After restart windows will recreate any temp files it needs. Do this cleanup periodically since some programs do not clean up after themselves very well. After you delete the temp file in the windows folder leave them reside in the recycle bin for awhile to improve your comfort level.
Dave