I've learned to run the SMART status and not much else. Firewalls, antivirus and more can cause those dips. But then again folk run other than stock setups, registry cleaners and then you have the malware and other issues.

It's come down to me being a sleuth but in this case all that's left is to ask you keep telling more. Also the Windows 7 forum might be more ontarget along with posts in game forums.
Bob