Nvidia issues

First let me appologize for the TLDR post I am about to make. Thought maybe someone here might be able to help me before I throw my pc out of the window.

Secondly I am computer illiterate so small English words for an answer would be appreciated.

I have a Dell Dual Core XPS system. I have the Nvidia Geforce 7900GS. About a week or 2 ago when I would log out of Coh my desktop would be sort of distorted. Not as in the graphics. It was as if somehow the display resolution had been changed. I had to sort of scroll down or left on my desktop to get to all of my stuff. Rebooting solved the problem so no biggie deal.

So after a couple times I realize this isnt just a fluke, something is wrong. So I go DL the newest Nvidia driver. So same problem happens every time I log out of COH, I reboot. However I then have no display. Monitor screen is dead to the world. I have to open up my PC and reseat my graphics card to get it to work. After several times of this I am getting irritated. I would easily say I just need a new graphics card if the problem wasn't only when I play COH. I play Aion with no problems. In fact I have no problems ever for anything except when I log out of COH. Playing the actual game is no problem either.

Anyone have any ideas on how I can solve this problem? I plan on upgrading my graphics card anyways but I am worried I will just run in to the same problem again so trying to find out if anyone else has had similar problems or knows of a solution.

i dont know if this is a branch of the same Gfx card + vista problem with CoH where the screen turns black and crashes CoH