geforce fx5600 i have to boot machine in safe mode, then re-install drivers, then everything will work, that is, until a couple of re-starts and then have to do it all again as the video drivers disappear. video card was fine in last machine , as I have just upgraded, amd64 new mobo, memory hard drive etc, tried the new geforce drivers also tried working my way back with older drivers, but it still does the same, anyone got any idea"s about this. the op system is windows xp.