This is a general information page for anyone who is planning on buying this particular machine from Wal-Mart, or has already.
At $300 and Windows 7 Premium, it's actually a pretty damn good deal. It does everything anyone will need provided they're not a "hardcore" video game player. The system also suffers from a few other setbacks:
You might be considering buying this machine and upgrading it to a cheap DVI-capable PCI-E 1x card, but you should know beforehand that cheap 1x video cards (as of this writing) are hard to find. There's not much of a demand for 1x cards, so the prices tend to be pretty high. Be prepared to pay $100 or more for a decent card. I managed to snag an Nvidia 8400GS for $25, so your mileage may vary.
Keep the power consumption in mind when shopping for your video card. The power supply is pretty damn weak, as stated above. Try to go with most economical card you can find, as a full-size 3D behemoth will slaughter your poor little power supply.
This PC resides in a slim-line case. That means when you purchase a new video (or other type) card, the bracket that holds it in place on the case must conform to the slim-line form factor. Chances are your card does not, so you'll need to purchase a slimline adapter kit. These can be had for around $6.
Slimline cases are hotter cases. This particular model, especially. When I remove the cover to the case, the temperature on my 8400GS GPU drops 20 degrees Celsius. If the video card you want to purchase comes with a dinky fan and heatsink, I strongly suggest purchasing a high-performance aftermarket fan/heatsink. They can make a huge difference. Keep in mind you may have to jury rig the 12V fan connection on the card.