Is the PC slow when not gaming?- No, It plays Battlefield 2/2142 and so on on max settings.
What OS are you using?- :-?
When was the last time you cleaned your PC out?-Just a few weeks ago.
What protection do you have?- Currently I am using Norton.
What kind of processor is that?- It is an Intel.
And try defragging. -Ill give that a go
Yeah, its very weird. Everything turned off/lowest settings still lags in combat :-/