I 2nd all that has been said. You might also need to clean out your junk and registory. Your pc might actually running slower, but your not seeing much of the drag untell you use DvDShrink cause DvDShrink gobbles up time on the cpu clock. Theres no good way to kick it off and maintain a good encode either. Theres several free apps on this site that'll help you out. AWC, and ccleaner to name 2.
Do you ever go and delete the analize log file? I use to never clean it out. I then noticed that Shrink would code slow or act funny. I would delete the folder and it would straighten up.
I have never cleaned out the log file on my system and I haven't had any issues. Not saying that it may not be a bad idea to do so, I just never found a reason.
