Windows 8/Dell Latitude D620 display driver

Can't find a display driver that will work with my Dell Latitude D620 and Windows 8 Pro. Just upgraded to Windows 8 but it won't let me change screen resolution from 1024x768, I used to be able to in Windows 7 and even Windows Release Preview. Went into device manager and saw a little yellow exclamation mark next to video drivers. Tried to install drivers from previous OS but it says that they are incompatible with Windows 8. Any help is appreciated. Thanks!