like a month ago, or two, I bought myself a XFX 260GTX, Nvidia card. When playing games, cod4 or assassins creed for example, the card fails. Im seeing strange blocks and colours all over my screen. I do have a screenshot of this issue:
after installing the card i didnt change anything in the bios AT ALL. i just installed the driver from the CD. is this something i can solve, or is the card just broken? I would love to see your reply here or e-mail at firstname.lastname@example.org.
I suggest you check the temperature under load, if it's excessively high then that may be causing it, also it'd be nice to know what PSU do you have.
after checking those and getting the possible temperature/power failures out of the way, you should scratch the software issues from your list. The easiest way is to make a clean installation of windows with the latest drivers, if the problem persists then the card is damaged and you should RMA.
try the card on a friends system to rule out your system as the cause. If its still does it, return the card and exchange it for a new one. If it does not do it, borrow a PSU from someone to make sure the card is not putting too much strain on yours(doubtful, but stranger things have happened.)