Hello,
If when you try to upgrade from Windows Vista to Windows 7 you encounter a hang at 62% this is usually related to a service running in the background that prevents the upgrade from
completing.
Below is a link to a Knowledge Base article that may offer assistance.
Hanging at 62% when you upgrade from Windows Vista to Windows 7
http://support.microsoft.com/default.aspx/kb/975253
Let us know how this works out for you.
Thanks
Michael
Microsoft Answers Support Engineer
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