This issue is about re-install network adapter in Windows Vista and the KB article for this issue will be KB945399 and published in a few days. The issue can be reproduced in many computer models and you will encounter it when you uninstall a network adapter device using Device Manager. Maybe you have to troubleshoot whether the network adapter driver installed is right to troubleshoot OS network issue. Therefore, after uninstall the adapter, you may try to install another driver for the device ... Everything works fine in Windows XP/Server 2003 and so on. However, when you try to do same action in Windows Vista, the popular OS nowadays, you will see soon after the uninstall process completes, PnP detects the network adapter as a new device and automatically installs the device and drivers. Instead, in Windows XP, only after you click to scan hardware change, the PnP will detect the network adapter and install the driver.