I've removed them the same way just fine. They were a bit too buggy for me.Originally posted by: Mem
You tried going to add/remove icon in Control Panel,remove all Nvidia software then after go to Nvidia folder in Windows Explorer,delete it and its contents & reboot.
Update: I`ve just gone back from 40.41 drivers to 30.82 and just had to remove the Nvidia driver software from add/remove icon in XP and reboot,if this fails you could try removing them in safe mode.