A few days ago I bought Grand Theft Auto San Andreas Second Edition and installed it. When I tried to run it it gave me the message "Original disc could not be found or authenticated." I rebooted and tried again and it worked fine. The next day I tried to start the game again and I got that same message. It hasn't worked since, despite rebooting several times. My specs: Athlon 1600+ CPU, Windows XP SP2, Sapphire Radeon 9600XT 128 MB, 384 MB DDR PC2100 RAM It's a legit disc, not a copy, and it's sitting in the DVD drive. The DVD drive works fine - it's an LG and it's just over a year old. Has anyone ran into this problem before? Why would it work one day and not work the next? I want to be able to play the game I paid good money for!! Thanks.