Helwin, don't feel bad..I have so much crap in mine, not only did I use my Crap Cleaner and delete and the temp files, history, etc.  Then I actually had to go into my registry and permanently delete all the files off of the registry. 

You should try downloading the Crap Cleaner CCleaner I can't remember the address, google it.  Its from piroform.  Its amazing.  You can manage your programs, clean all your temp files, history, etc. down to the DOD level.

Simple to use, no cost, no trouble.  Best thing I ever put on my computer.