nvidia geforce2 mx/mx 400 agp card problems. why?

hi i installed a nvidia geforce2 mx/mx 400 agp card in my custom computer. but when i installed the drivers for it, i just get a blank screen, and the monitor receives and loses a signal. i uninstalled the drivers, and it works, but if the drivers are installed, it doesn’t. why wont it work?

please tell me why

*note: windows xp home edition, 256mb ram, 10gb hdd,’98 mobo