Display driver has stopped responding and recovered

I have a month old installation of Win 7 64 bit, never had any problem with it 'til today.
Was just surfing the web on FF4 and all of a sudden, the screen goes black, comes back after 5 seconds and displays the "display driver has stopped responding and has recovered" message. It's a new graphics card (1 month old), so I don't know what the problem could be.
Any help on the subject would be very much appreciated.

I think it is best to remove the graphics card and put it back, it might be loose.

No. it's an Nvidia; Gigabyte GTS450. It's not overheating, I checked and it's seated properly.

Reinstall the drivers, doing a clean installation.If that doesn't work, roll back to the last drivers which worked for you properly.

I reformatted a month ago, installed Win7 & every driver needed, including the latest drivers for the graphics card, from the Gigabyte website. It's the first driver, so I can't rollback. Maybe I should have installed the driver from the Nvidia website, but I don't know if the latest nvidia driver is supported by my card.
Wouldn't it start giving me trouble earlier? I've played Call of Duty MW2 and other newer games without problems, and it seems strange it would 'crash' while just surfin' the web. I read , that it is possibly Win7 power managment options related issue, here's the link. Tried it and haven't had the problem since, hope it wont start again.
Gonna try to reinstall the driver, can't hurt. Is it better to uninstall the driver first, before reinstalling?

With the newer driver versions, there is an option in the installer to do a clean installation which automatically removes the previous driver before it begins installing the new drivers.I would try doing that at first.

Yes, download it and perform a clean installation. 267.52 are beta drivers, and I don't recommend using beta drivers unless others have reported them to be stable.