During DISK CLEANUP, is it safe to check the box that says: Compress Old Files?

I just recently had my computer serviced & they replaced the hard drive, installed the drivers & then had to manually install Windows Service Pack 3 (KB936929). Now when I click on Local Disk (C:) Properties, the amount of disk space used went from 5000 to 9000, so I clicked on disk clean up & the is a box next to... show more I just recently had my computer serviced & they replaced the hard drive, installed the drivers & then had to manually install Windows Service Pack 3 (KB936929). Now when I click on Local Disk (C:) Properties, the amount of disk space used went from 5000 to 9000, so I clicked on disk clean up & the is a box next to Compress old files 198,963K:
http://s118.photobucket.com/albums/o81/r...
Is it safe to delete those files?
Update: Oh, I forgot... what about the WebClient/Publisher Temporary Files?
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