When upgrading from Windows Vista to Windows 7, a number of people have experienced the situation where the upgrade stops responding at 62% and does not resume. In addition, Windows creates a file that is named system_drive:\$WINDOWS.~BT\Sources\Panther\setupact.log
As explained in Microsoft Knowledge Base Article 975253, Upgrade stops responding (hangs) at 62% when you upgrade to Windows 7, this is because the Iphlpsvc service stops responding during the upgrade. According to KB 975253, it could also be other services causing a problem which results in the upgrade process hanging at 62%.
Microsoft released today a Fix it to fix the problem automatically. Note the caveat below specifically indicating that this solution is only to be used if the upgrade stops at 62%.
Important
The Fix it solution is ONLY if the upgrade stops responding at 62%. Do NOT use it if the upgrade stops responding at a different percentage than 62% or if the log entries are not logged.From KB 975253:
Fix it for Me
To fix this problem automatically, restart the computer where the upgrade to Windows 7 fails at 62%. Your computer will roll back to Windows Vista. Either download the following fix to a flash drive or to a CD or return to this article on the machine where the upgrade fails. If you return to this article on the machine where you experience this problem, click the Fix this problem link. Click Run in the File Download dialog box, and follow the steps in the Fix it wizard.
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