To auto delete the temporary folder, follow the next steps:

1. Start -> Run and type gpedit.msc and click OK.
    
2. Select -> Computer Configuration/Administrative Templates/Windows Components/Terminal Services/Temporary Folder
    
3. Then right click "Do Not Delete Temp Folder Upon Exit" Go to properties and select disable (see picture 1).
    

   Picture 1

4. Now next time Windows puts a temp file in that folder it will automatically delete it when its done!
   

Note: remember, gpedit (Group Policy Editor) is only available in Microsoft XP Professional.