Character turns everytime I right/middle click (unresolved)

Hey everybody, I just installed MNC a few hours ago and I've noticed an odd problem that I can't seem to figure out. Every time I use right click or the middle mouse button my in-game camera view will shift. It's as if I've suddenly spun my character 90-180 degrees to one side every time I press either of those buttons.

Here's the info I've gathered so far:
1) The amount of turning is not consistent, and is not directly to one side. Sometimes it will move the camera view down or up, left or right. Also, if I click slowly (as in clicking it down, holding it, then releasing it) sometimes it will turn on the downclick and sometimes on the release.
2) When I changed the bind of my alt-fire button to "p", my right mouse button still spun my character while "p" performed alt-fire without any problems.
3) I unplugged my mouse and plugged in another and the problem was still there.
4) I have not found any setting from the in-game options menu that gets rid of this problem.

I am using XP Pro, service pack 3, 3 GHz Pentium D, Nvidia GeForce GT 240, 4 gigs of RAM


Thanks for your help,

Ben

Re: Character turns everytime I right click or middle click

When the camera turns, do you see the front of you character or are they turning as well?

My first inclination is to ask if you have a joystick or controller plugged in.

Re: Character turns everytime I right click or middle click

The character is turning as well. It's exactly as if I move the mouse a few inches in either direction, except it's instantaneous when I press either button. I do not have a controller or joystick plugged in.

Anyone have any ideas at all about what may be causing this problem?