I am far from being an expert but with no other response to your posting I`ll try.
It sounds as if you are short of a graphics driver for your graphics card/chip. If you have a graphics card try booting from the CD that came with it and reinstalling the driver. If they are onboard graphics then try the cd that came with the motherboard.
If neither of these work I suggest you may have no choice but to do a repair with your system disk. I`m presuming you are using XP?