My computer has become very slow the last few weeks doing just about anything games(fairly demanding ones) internet explorer, the typical stuff college kids would use a computer for im not some engineering major with some ridiculous software on it. Specs are as follows - Dell xps8300 intel i7 processor 3.4 ghz 8 gb of ram windows 7. I have feeling ive just failed to clean it which im going to do after this post, but I run a defrag monthly and have Kaspersky pure 2.0 any ideas what else I can do to fix it if cleaning doesn't work?