Upgrade stops responding (hangs) at 62% when you upgrade to Windows 7

Microsoft has published an awesome article on this:
When you try to upgrade your computer from Windows Vista to Windows 7, the upgrade process stops responding at 62% indefinitely. 


Additionally, Windows creates a file that is named system_drive:\$WINDOWS.~BT\Sources\Panther\setupact.log. If you examine the contents of the file, you notice the following information: 

<date> <time>, Info                  MIG    IPostApply::ApplySuccess for Plugin={ServerPath="%windir%\system32\migration\IphlpsvcMigPlugin.dll", CLSID={ade10465-2a43-454e-b0a7-3f220a61bd03}, ThreadingModel=Apartment} - Working directory: C:\$UPGRADE.~OS\OnlineUpgradeApplyWork\srcworking\agentmgr\CCSIAgent\005AE0CB
<date> <time>, Info       [0x0808fe] MIG    Plugin {ade10465-2a43-454e-b0a7-3f220a61bd03}: IphlpsvcMigPlugin: IphlpsvcMigPlugin: Performing upgrade actions for all protocols
<date> <time>, Info       [0x0808fe] MIG    Plugin {ade10465-2a43-454e-b0a7-3f220a61bd03}: IphlpsvcMigPlugin: IphlpsvcMigPlugin: CountInterfacesOfAType for 0.InterfaceCount ptr = 1dae2b8, InterfaceCount = 0
<date> <time>, Info       [0x0808fe] MIG    Plugin {ade10465-2a43-454e-b0a7-3f220a61bd03}: IphlpsvcMigPlugin: IphlpsvcMigPlugin: CountInterfacesOfAType for 0.Incrementing interface count
<date> <time>, Info       [0x0808fe] MIG    Plugin {ade10465-2a43-454e-b0a7-3f220a61bd03}: IphlpsvcMigPlugin: IphlpsvcMigPlugin: CountInterfacesOfAType for 0.InterfaceCount ptr = 1dae2b8, New value of *InterfaceCount = 1
<date> <time>, Info       [0x0808fe] MIG    Plugin {ade10465-2a43-454e-b0a7-3f220a61bd03}: IphlpsvcMigPlugin: IphlpsvcMigPlugin: RegEnumKeyEx return 259. key name: {AC049C3C-9B90-41A7-9385-DC5AD3E656F0}.new index: 2
Warning [0x080b50] MIG AsyncCallback_ApplyStatus: Progress appears to be stuck. Current progress: 62

Note Generally, drive is drive C on the computer.


Cause: This problem occurs because the Iphlpsvc service stops responding during the upgrade. 


Note Other services may also cause a problem in which the upgrade process stops responding at 62%.


Resolution:

Important Do not use this resolution if the upgrade stops responding at a percentage other than 62% or if the log entries are not logged. For more information about how to open the Seupact.log file, see the More Information section.

To have us fix this problem for you, go to the "Fix it for me" section. If you prefer to fix this problem yourself, go to the "Let me fix it myself" section.

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.

Fix this problem 

Microsoft Fix it 50319