I got the base The Sims 3 game from the library and installed it on my computer. I have to give the CD back so I tried mounting the iso file with Daemon Tools Lite. The game starts to load but then it says "We are unable to verify that your disc is a valid copy of The Sims 3. Please contact customer service." Is there anything I can do to get around this? Would burning the disc image to a CD or DVD help?