Certain programs open very slow

Currently I am having an issue where certain programs open/run very slow such as itunes, disc defrag, and it reads cd-roms extraordinarily slow. It takes about 5 minutes to open then and after they are opened they continue to run very slowly. The odd thing is that not all programs run slow or even load slow, most other programs open and run fine like FF, WoW, Avira, and css. I am using windows 7 ultimate 64 and my pc consists of...

4gb ram
core2duo E8400 3GHz
asus P5N-D MB

I did a clean install when i stinalled windows 7 (use to have windows xp) about 2 months ago and have had the issue ever since installing windows 7. I have tried to find fixes but nothing seems to have worked. I do realize that others have had similar issues with itunes, however; since the problem seems to be an issue with other programs I figured that there was a much larger issue.

Thanks in advance!

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