Windows 7: Forgotten password help...

my friend works at a shop/gas station. they hired a new gas attendant so they set a password on their win 7 machine which also runs the billing software and their ALLDATA car information for the mechanics. but the owner forgot the password he set get into windows. i tried running ophcrack as a bootable cd, but it had no luck. he also gave the computer to one of those on call "computer tech" guys who said he had 7 different programs and none of them could crack the password. anyone have any other way to bypass it or figure out the password he forgot?

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