All Windows operating systems use the "c:windowstemp" directory to store uncompressed files, e-mail attachments and temporarily required files. These do not get automatically deleted and result in a very large directory of unwanted files.Therefore, to delete unwanted temporary files when you startup every time, simply add in this line to your C:AUTOEXEC.BAT file:
"Echo Y|If Exist C:WindowsTemp*.* Del C:WindowsTemp*.* >Nul" This will ensure that the temp directory is empty every time you start up your PC.