upgrading from windows 32 bit to 64 bit ad now graphics card cannot be recognised

ALL4H

Honorable
Nov 3, 2013
2
0
10,510
to clarify i did a custom install not an upgrade since the option wasn't available.
i was installing new ram and had to upgrade to 64 bit for my computer to take it.
i know i didn't damage my graphics card in the installation of ram because GPUz can recognise the card however device manager and nvidia control won't recognise it.
my graphics card is the nvidia geforce gtx 570.
i also just ran the witcher 2 on high settings and it was working just fine.
any ideas how to get my computer to recognise it?