Framerate issues on new source games.

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I already posted this in the portal forum but now that think of it it's probably better suited here than there.
I just bought the orange box, for the games I didn't have(ep.1, ep.2, portal, tf2) and my problem is the main menu screens in Portal, Team Fortress 2, and Episode 2 are all "stuttery", as in It takes forever to click on one option and the ambient music reminds me of how a cd skips, and whenever I load up a saved chapter I get 1fps in game. I have the latest drivers (Forceware 169.21), I think I have my latest sound card drivers, even If I don't I know it's not that since I disabled It and the problem persisted. I can run Crysis and every other game fine and on high settings, it's just the certain games that I aforementioned that give me this problem. Even TF2 with the picture for a background gives me the stuttering issue... The wierd thing is HL2, CSS, and Ep.1 run flawlessly, It's just the new source games with achievements and all that gravy.

This is what I've done to troubleshoot so far:
Defragmented the game files.
Verified their integrity.
Disabled and re-enabled my sound card.
Defragmented my whole hdd.
Disk Cleanup.
Uninstalled and deleted all files related to Source-based games. Reinstalled everything Starting with orange box first.
So after all that I've made no progress and I'm totally clueless as to what the problem could possibly be...

I've also been having these strange screens come up where my computer is only outputting one color and the cursor, so for example I left my computer on for about 5 minutes and when I came back my whole screen was purplish with the ability to move my cursor around and apparently click on stuff since "the hand" came up numerous times, the only thing was I couldn't see what I was doing and the only way it seemed I could turn off my computer was by holding down the power button. This might be off topic or related to my problem with portal, tf2, and ep.2. I'm just not knowledgeable enough to say whether it is or isn't. Any help with this would be greatly appreciated. Thanks.

Here's a video I recorded to show you guys exactly what's going on to help you all diagnose the issue. Stuttering Issue
 
*Bump*, any help would be appreciated. Would reformatting even fix the problem or it a most likely a problem with my graphics card or Orange Box disc? I just need some suggestions since I want to get to playing asap. Thanks.
 
sounds like you tried everything besides formating.
 
Yes I have nvidia stuff. I did what as instructed on the website and everything is perfect now, thanks a ton for linking me there you get an A+. :)
 
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