Computer May not recognise 2nd Video Card

I got 2 ATI Radeon HD 5770 series graphics cards, they were installed by MSY Australia, and was running perfectly. However after some technical difficulties, I had to reinstall Win7 to remove the problems, however after installing the driver software, I realised that my second moniter wasn't working.

System
Intel i7-860 Core 2.8ghz
HIS ATI Radeon HD 5770 x 2
8gb Ram
Win7 64bit Home Edition

At the moment, Im worried if my second card is working at all, as any system programs that came with the drivers say, theres no second driver to configure