There should be an icon in the Control Panel called "Scanners and Cameras"
Under the Device Manager for the X200, the device that controls the camera is called:
"Imaging devices" > "USB Video Driver"
The actual default XP driver is a Micro$oft driver so maybe you downloaded some Windows updates that killed it?
Looks like you can also just download the driver from the Lenovo website:
http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=MIGR-70600Or search on the Lenovo website for the below file, 7tca23ww.exe
Version: 1.32.500.0
Release Date: 2009/10/02
File link File size File description
7tca23ww.exe 9,883,832 Integrated Camera
7tca23ww.txt 9,162 README for Integrated Camera