Unsigned drivers are normally the source of driver problems in Windows XP.By using sigverif -command line tool is the easiest way to get a list of all unsigned drivers that are installed.
The log file Sigverif.txt,is saved in the Windows folder. Third-party drivers that are unsigned are displayed as "Not signed.".After you find unsigned drivers, you can disable them by using any of the following methods:
- Disable the device in Device Manager (you may have to click Show hidden devices on the View menu, and then disable the device under the Non-Plug and Play Drivers branch).
- Uninstall the software that installed the third-party driver by using the Add/Remove Programs tool in Control Panel.
- Rename the driver in the Winnt\System32\Drivers folder.