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Episode 1 starts and runs fine, the tutorial runs and the "back" button works. Episodes 2, 3, & 4 run for 1 min 20sec with no indication of activity except in the Task manager-processes tab. Then the screen goes to black for another 1:15 before starting. Tutorial then will not run or freezes the computer. Win XP3 with all drivers up to date. Have re-installed the game and tried resolution settings etc w/ no luck.