Camera/Mouse Jittering

[RSnider]

First off, I'm fairly certain the jitter I'm experiencing is due to the high res DLC pack because A) it only started after I installed the high res pack and B) it is less severe when I turn down the view distance sliders in the options menu of the launcher. However, what has me confused is why it is jittering in the first place, given my PC shouldn't have any problems with the high res pack. My PC is:

 

Phenom II X2 Black, OC'd to 4.0 GHz

XFX Radeon HD6870 1GB

4GB G.Skill DDR3 1800

Windows XP 32 bit

 

I'm using the Catalyst 11.10 video driver and ATI Tray Tools to force AA and AF. Anything newer than 11.10 breaks forced anti-aliasing through ATI Tray Tools and/or CCC (tried both with identical results - couldn't force AA through the driver, and yes, AA was turned off in the Skyrim launcher). I have no idea why the newer drivers won't let me force settings, so I just stick with 11.10. I am running 2xSSAA and 16xAF. Before suggesting I turn off super-sampling and turn down AF, I have tried Skyrim with AA and AF turned off entirely and it has zero effect on the jittering.

 

The jitter I'm experiencing is like the camera suddenly becomes very twitchy. My framerate stays decent when it happens (30-40 fps) and all animations are smooth, but as I move the camera, the mouse and/or camera is jumpy, not smooth. Today I performed a full reformat and re-install of Windows. The only mod I have installed at the time of testing is Vano89's high res pack fix, so it's not like I'm throwing a ton of textures at my GPU on top of the high res pack. Additionally, the jittering only occurs at specific places and always occurs at said places. For example, if I exit Whiterun's main gate and walk straight forward to the wall and face towards the guard tower where you fight the first dragon, it becomes jittery; however, if I stay in the exact same position and just turn to face the Whiterun stables, the jittering goes away completely. The entire time, my frame rate doesn't drop below 40 fps.

 

 

Does any of this make sense to you? Is this all perfectly normal and I'm just asking too much of my machine? Is there any way to get rid of the jitter or do I just have to live with it?

[Kabanzai]

After that downloaded content My camera twitches too, even WITHOUT the high res added on.

[AngeGardien]

you are on the limit, the require memory are 4gb tou have it but just on the line, and after you need igb of video driver, well, my crazy brain have forgot how you have, anyway, make sure you have it, else you will need to reduce quality graphic to obtain a little more speed, but i suggest you to begin by lower the shadows, it's can help big...