Problems with old nVidia MX 400 card

I'm trying to put together an old working system for my daughter using an
MX400 card.

Although it installs OK (using the latest certified driver) it stops working
after every reboot and my system reverts to VGA. Oddly, if I disable and
immediately enable it (in device manager), the warning goes away (although
the system still appears to be running in VGA mode since it's still slow).

The PC is running XP Pro.

Any ideas?

Cheers.

Bobby