Hi, I have just encounter similar problem with THD, in vista. Check your Device Manager, see if there is any unknown device. If so, probably due to driver not install. Right click, then "Update Driver", should solve your problem. If not, try "Update Driver" again, and this time redirect to windows/system32. If there is any new device found after you install, just repeat the steps above until it finish.

Hope it helps. (It helps to solve mine. ) Check THD thread for more info.