WTF is artifacting?  It's those goofy pixel trails or blocks that appear on your screen while you are trying to frag opponents.  There are multiple contributors to artifacting:  over-overclocking, bad or old drivers/software or worst of all hardware malfunction.  Any one of these factors can cause unwanted pixelation or the dreaded artifact.

So how do we deal with this issue?  When fixing any hardware/software issue the best way to approach is to isolate the problem by eliminating all possible contributors to to the problem.  Establish a list of all the things that can cause problems within your system and then attempt to fix them one by one.   A possible list might look something like this:

1. Run a virus scan and then follow up with a spyware/adware scan
2. If you are overclocking, stop for a little while and shut it down
3. Check to make sure all you drivers and windows updates are up to snuff
4. Think about whether or not another piece of hardware could be contributing to you problem (drivers too)
5. Try some other games or software and see if you are experiencing the same problems 
6. If you have another video card try swapping it out with another
7. Hit up your friends for ideas, remember you might be overlooking something really simple
8. When you have eliminated the impossible, whatever remains, however improbable, must be the truth
9. After all that, mebbe you need to get a new video card, don't think of it as a problem... but an opportunity to upgrade!