It might happen that your computer gets frozen or does not respond at 62% mark when you upgrade your computer from Windows Vista to Windows 7. During this Windows creates a file which is named system_drive:\$WINDOWS.~BT\Sources\Panther\setupact.log. the upgrade getting stuck at 62% problem can be fixed by reading the contents of this file. In setupact.log file you will find information as shown below:

, Info [0x0808fe] MIG Plugin {ade10465-2a43-454e-b0a7-3f220a61bd03}: IphlpsvcMigPlugin: IphlpsvcMigPlugin: Performing upgrade actions for all protocols
, Info [0x0808fe] MIG Plugin {ade10465-2a43-454e-b0a7-3f220a61bd03}: IphlpsvcMigPlugin: IphlpsvcMigPlugin: CountInterfacesOfAType for 0.InterfaceCount ptr = 1dae2b8, InterfaceCount = 0

Moreover this problem occurs if the Iphlpsvc service stops responding during the upgrade process but some other services may also cause a problem in which the upgrade process stops responding at 62%. Please note that the steps given to fix this problem are only if the upgrade process gets stuck at 62% and do not use this resolution if the upgrade stops responding at a percentage other than 62% or if the log entries are not logged.

Follow the steps given below to fix this problem

1. Restart the computer which will make it to boot to Windows Vista which is the earlier operating system.
2. Go to Start and right-click Computer, and then click Properties.
3. Click Environment Variables in the Advanced tab.
4. Click New under System variables.
5. Type “MIG_UPGRADE_IGNORE_PLUGINS” in the Variable name field.
6. Type “IphlpsvcMigPlugin.dll” in the Variable value field.
7. Press OK three times to close all the open dialog boxes.
8. Start the Windows 7 upgrade installation process again.

How to open the seupact.log file?

To open the setupact.log file during the upgrade installation process follow the following steps:
1. Press SHIFT+F10 to open the command prompt window
2. Type C:\$WINDOWS.~BT\Sources\Panther\setupact.log and then press ENTER.
To open the setupact.log file after the computer restarts back into Windows Vista:
1. Click Start and type C:\$WINDOWS.~BT\Sources\Panther\setupact.log in the Run box.
2. The seupact.log file will get opened in the notepad window.
3. Scroll to the bottom of the file to view the latest log entries.

Use Microsoft’s FixIt Tool to fix this problem

For fixing this problem automatically, please restart the computer where the upgrade to Windows 7 stuck at 62%. On restarting the computer will roll back to Windows Vista. If you are on the computer which is experiencing the problem then open the link (http://go.microsoft.com/?linkid=9693817). If you are not on the machine which has problems in upgrading then download the file toa flash drive or a CD and take it to the problematic computer and execute it. This FixIt file is a MSI file provided by Microsoft for fixing this problem automatically and will not require you opening the Variables window or un-hiding the system files.

This Article applies to all the Windows 7 editions which were upgrading the following Windows Vista editions : Windows Vista Business, Windows Vista Enterprise, Windows Vista Home Premium, Windows Vista Home Basic, Windows Vista Ultimate