Please help with computer?

I just want to know if there is a free program out there that will tell me what files on the computer i need and what ones i don't i have entirely way to much on it and have deleted what i could but it takes hours for my antivirus to run and my adware scan the same. I just want a free program that is not trial just totally free that can decipher what is needed and what is not or if there is a way to tell what file goes with what program thanks

Please help with computer?anti virus

Tune up utilities 2006 will optimize your system and delete unnecessary files it has free trial get it from www.download.com

Please help with computer?auto protect

XP comes with disk cleanup (found in Start-%26gt; Programs-%26gt;Accessories-%26gt;System Tools). After you do this, you want to close all running programs, especially those with icons beside the clock in the lower right-hand corner. Then run Disk Defragmenter (also found in the same place as disk cleanup). This will help your hard drive run more smoothly and faster.
whats needed and whats not is totally dependant on what you use the computer for.. the best thing i can think of is if you go to control panel, and add / remove programs.. it will tell you how often each program is used, and when the last time you used it was