I have tried the usual things, ie defrag but nothing seems to help, I have uninstalled all the games I had on and other programs no longer in use but it is still extremely slow.

I have a dell/intel pentium 4/with XP that use to be very fast, but over the last year its gradually gotten VERY slow. I’ve done all the basics (cleaned up my desktop, removed unnecessary programs, did a virus/spyware scan, checked for errors, and defragmented) but my computer is still very slow. Any ideas?