So recently I've noticed that my hard drive slowed down after installing programs. it is a 1T HDD with 70% occupied. I do not have spyware and malicious software because I use autoruns and process explorer to check my system registry, processes, startup files, etc. I haven't used chkdsk yet, but I did use fragment 2 weeks ago. Does hard drive speed drops after some time? The reason being that my friend's shitty laptop responds faster than mine. I have intel i7 with 6 gigs of 1.6GHz RAM, etc. He has a laptop that is an old celeron with 1gig of ram and 5400RPM HDD whereas I have 7200. We both use windows 7.