gui miner scrypt does not recognize graphic cards, any idea how to fix

[bittencoin]

Hi,

I shutdown my mining rig earlier this summer, and took out my graphic cards and uninstalled the ati catalyst driver.  Now I reinstalled the cards and drivers.  Catalyst and MSI's overclocker tool recognize the cards, but the guiminer does not see the cards, the drop down selections only show the CPU. 

Any idea what the problem is?

Thanks.