Maybe it's not RAM that I am clearing...

Maybe I should have posted in "Newbies." I am running Windows 7 and I regularly use Disk Cleanup. I also use Control Panel/Internet Options/Clear history. Occasionally I'll have time to dump old Word files that I'm no longer using -- or transfer them to an archive disk. I used to dump temporary JAVA files (found a button or icon to do that) but it didn't seem to make any difference and someone said I shouldn't do it.. So maybe I am not clearing RAM at all!

Still... any suggestions for free software that would help me speed up my pc -- start-up and opening various programs and files -- would be greatly appreciated. Also, it does freeze occasionally.

(And thanks for helping me learn about RAM!)
Ellie