Disks ain't expensive these days. Get yourself a fresh disk and install on a clean slate; don't wipe your original disk. During the fresh installation of some tried and true software that you used for years the installer may say -> number of licences exceeded, deactivate one license first. If you then don't have your original boot disk or got some corrupted original Vista disk or whatnot, you may be in license trouble ...

Happened to me with an Adobe license.

'Course you could deactivate all relevant licenses in the first place and then run the upgrade or an installation on some formatted original disk.



Martin