Installed production software for Windows 7:

Microsoft Office 2010 professional.

Adobe Master Collection 6.0.

Norton 360.

Also have language dictionaries/translation software (Word Magic).

Windows updates, all of them, for my system.have been installed.

So, why do I have mouse stuttering/pauses doing normal non-game stuff on my system?

Suspect is Norton 360 which, Semantec claims, monitors everything.