Although this is related to VLIDE, it's 2008-specific and you don't need any particular knowledge to try this, which is why it's in the 2008 section and not elsewhere.
In AutoCAD 2008, please enter the command VLIDE and have a look at the icons. Do they look normal or do they have funny colours?
The attached image shows the difference: the normal 2007 ones are shown on the top, the funny 2008 ones are below. The colours are not consistent: if you close AutoCAD and restart it, you may see all sorts of colours.
If you feel like being really helpful, please post and let me know if you had the problem, with details of your graphics card, driver, OS and RAM. Thanks!