Mant miss the steps for installing motherboard, usb and other drivers. Microsoft doesn't do this for us.
Also, you should try it with just one stick of ram. Here's why. If the video memory is from CPU memory, then there can be issues they didn't tell you about. In no uncertain words I write that you then have a warranty issue with the system supplier.
Bob
Help please, I've just finished building a PC for my girlfriend's brother (getting in the good books and all that!) and after finishing I have realised that there is a problem.
The system has an ABit NF7-M motherboard, with NVidia GeForce4 MX graphics integrated, and i have 2x512 Crucial Mem RAM.
I installed WinXP on the PC, and everything was fine (or so I thought), put in the CD for motherboard/graphics driver - and noticed that the new window had some horizontal lines running across the image, making it difficult to read. After a bit more delving, I realised that it wasn't just off the CD that this happened. Sometimes when opening menu over the taskbar, closing menu, a bit of the menu would still be visible where it overlapped the taskbar. Sometimes after opening windows, horizontal grey lines eill appear on the desktop to the side of the window. Running any WinXP screensaver is a nightmare! The 3D pipes screensaver struggles like hell. Parts of the pipes are missing, parts of the pipes end up in places where there shouldn't be any, and there are horizontal lines flickering on the screen.
I am tearing my hair out in frustration here - this is the 1st pc i've built and then this has to happen......
I have checked to see if the drivers have installed properly - they have (GeForce4 MX driver version 4.4.0.3) according to the system properties. Have tried different res - 800x600, 1024x768, 1280x1024 but the same, also tried from 32bit to 16bit - got a bit better, but not much. Any ideas please?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic