Office Depot lies about Copy right law

I purchased the product "Media Now" after talking to one of the sales associates about it's compatability. The product would not work with Vista on a 64 bit system. I took the product back and told it could not be returned because I might have made a copy of the program and that it was against the copy right laws. I filed a complaint with the company and was told the same thing by one of their managers. I researched the copy right laws and there is no such law. If there were no software could ever be returned and many companies will take the program back if they don't work. It is simply Office Depot's policy to assume that every customer is a thief. That is their privilege, but they should be upfront about it and not lie to their customers.