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Go to your MTU folder(normally c:\Program files\Micro Technology Unlimited) and locate the Microstudio installation file. I don't know which version of Microstudio you have, but the last version installation file would be mstudio2611setup.exe
An older version may be worded different, but would still contain a Microstudio reference and end in .exe
Double click it and see if the install shield gives you the option to install UPGRADE, (or REPAIR in an older version). You shouldn't have to enter a registration code if that is there. If it calls for one, you won't be able to install without it, but you won't be any worse off than you are.
George
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