Acer PSD Wont Work The pword loads but cant find psd?

I have an acer aspire 4720z (Vista) and i have acer management. My hard drive is formatted into 2 parts. i installed windows 7 on the other drive. But know my psd wont work cause i formatted it. How can i fix this. I updated the program but i dont want to delete it cause im affraid ill have to buy it again. It came activated with my computer. I found its serial number..