Very Short (Annoying) Hangs

My computer, when Minimizing/Maximizing any windows, will not let me move my mouse cursor until it has minimized/maximized. Its short, but annoying and shouldn't be happening.

I'd think it to be normal on a low-power machine, or one with bad graphics and can't animate it, maybe bad RAM or slow CPU, but my system is;

3.0 GHz CPU (e8400)
2 GB DDR2 667 MHz Ram
2 * 8800GT Running SLI

It doesn't seem to happen on Boot, or shortly after, but I'm at a loss as to how to fix it!

Generally the only programs I have running at once are: Peer Guardian 2, Windows Live Messenger, uTorrent (Latest), Firefox, and of course my virus scanner, Avast Home Edition.

Firefox, Messenger, PG2 and uTorrent I open up after my PC boots and can't recall having these problems when they are NOT running. Likewise, same programs on Vista Home Premium and nothing like this, and Ubuntu 8.10 and nothing like this.

I check my Task Manager and see no CPU Usage spikes when I minimize/maximize windows.

Does anybody have a clue

It may be utilizing the swap file since Utorrent is running.
2G of ram isnt all that much when several things are running.
Try to pause Utorrent wait 5 mins. and see if it gets better.

I dont think the 533 to 667 speeds will make much difference compared to the advantages of the extra 1 G.
Your memory will revert to 533mhz but if you can afford it grab 2 more Gs of memory of the same or higher speed as memory is pretty cheap right now.

If you put in higher speed memory it will still run at 667mhz.

See if you can get a screenshot of your task manager or a hijack this log and post it here.
Maybe we can see something that you dont.