Well, it is obvious that you had a problem, and that it might be common to others. Even Microsoft recognized it as they've come up with a hotfix. There's no possible way I could refute that.
Now, from the example you have used, and I quote:
...when I would try to run let's say an anti-virus scan and an anti-spyware scan @ the same time, my system would bog down like it was fully loaded even though task manager showed no to little cpu activity.
During a HDD scan, you are fated to experience some lag if the programs you have up running try to access the HDD, or even if you decide to load something else.
My observation was made to this context. Although I admit I mistakenly took your example as what had actually happened. And I'm sorry for that. :wink: