Officially Canon not suport drivers for x64 system (XP and Vista)
http://cr.am/framed.php?url=http%3A%...ef=driverguide
You can try two methods
1.Open "Add new hardware" (hdwwiz.cpl) and try drivers for LBP 2460 or LBP 3260 - unfortunately there is no driver exactly for your model
2.I found this thread:
Driver for Canon LBP 2900 (Vista 64 bit)
Try drivers from post 6.