Recently, so many users, who use Windows 8, met driver problems after installed Windows 8 Consumer Preview. Most of you have an old driver, and once you update to the newest one, your Windows 8 may work better.
I've searched a free driver update software for you, and it works really good according to my test. You may have a try, see if it can help you to deal with driver problems under Windows 8 Consumer Preview.
Click Here To Download Free Driver Update Software for Windows 8
PS: This driver update software is free to use. However it has some limitations due to its pro version. Anyway it is something of free.