Make sure you have the serial number from when you purchased TMG 7. Download and install the "30-day free trial" from the WG website - this insures you install the latest version. Unlock it with your serial number, and enter the email address you used when you purchased it.
You didn't mention your data. Is it still safe? If not the easiest way to recover it is to Restore a backup on the new installation. But if you have external exhibits attached, and if they are in several different folders, you need to restore then manually and not from the TMG backup.
installed TMG7 new computer
in Older Products and Versions
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Thanks Terry I will try it as soon as possible
my data are safe on my backup disk