I recently had my computer crash due to a TROJAN virus and at that time I had Windows XP service pack 3 which my computer man installed for me. After being infected I had to completely reinstall EVERY thing on my computer taking my computer back down to Service Pack 1 the only operating disks I had. Now when I do a Disk Clean Up, it doesn't have the option to "Compress Old Files." Can some one please tell me why this option is not there and how I could go about fixing this. Thank you.