Camera changing angle when sprinting/aiming

Hi there.

My problem is as follows. When I press spacebar or right mouse button to sprint/aim during combat or sprint outside combat, my camera angle decides to change itself about 90 degrees or even 180 degrees sometimes. I have all the DLCs except Firewalker and Alternate Appearance Packs.

My computer:

OS: Windows 7 Home Premium service pack 1

CPU: Intel Core i5 2500k @ 3.30GHz

RAM: 8GB

Video Card: ASUS ATI Radeon HD 6950 2GB DirectCU II

Audio: ASUS Xonar DX

DirectX: 10.0

Mass Effect2.exe 1.02

Mass Effect2Config.exe 1.03
Mass Effect2Launcher.exe 1.01

I have not modified my game in any way. The problem is present throughout the entire game, sometimes it's there when I first launch ME2, sometimes it's not there for a couple of hours then it appears again.

This is extremely annoying when playing as an Infiltrator. I peek out of cover, trying to line up a perfect headshot but instead of aiming at the enemy's head, I'm aiming at the wall next to me. I'd love to include a video of the problem, but the upload speed of my internet is terrible. Though, if it would be crucial to solving the problem, I'd try to upload it.

Thanks for any help possible.