I'm not at all sure that AVToolTipView is part of the Nvidia software, it may have been an extra that came on the driver disk. You should be able to disable it from running at startup. Start - Run. Type in the box msconfig and click ok. In the new window click on the Startup tab and see if you can find an entry that looks like AVToolTipView and remove the tick from the box alongside it. Click ok at each prompt and reboot. You should now be running without the offending item.