2000 you should have Service Pack 2 installed. If your computer has an AMD processor and a VIA chipset, you may need to install VIA's 4in1 driver package. Click here for more information.
Also, if you have installed other camera drivers, this could also be an issue as Windows still has problems handling multiple video capture driver files. You will need to uninstall any other video camera drivers. If you still have problems and your computer has a VIA Apollo KT266 chipset, there is also a "Beta USB filter patch" to try. This file can be downloaded from VIA's Drivers page.