It sounds like your trying to install a 32 bit driver
for a 64bit system.
Please go to device manager>right click on the device>Properties> details tab> drop down menu> select hardware Id> Copy and Paste the hardware id string. Then we can try and find a 64bit driver for your card.
Also please take the time to go to your User CP and fill in your system specs here
This will help us know all your hardware for any future issues you may have.
If you need help you can use this program to help find your hardware HWiNFO & HWiNFO32 - Hardware Information and Analysis Tools