When you upgrade your computer from Windows Vista to Windows 7, the upgrade process stops responding at 62% indefinitely. This problem occurs because Iphlpsvc service stops responding during upgrade. Note other services may also cause a problem in which upgrade process stops responding at 62%. Important Don’t use this resolution if upgrade stops responding at a percentage other than 62% or if log entries’re not logged. For information about how to open Seupact.log file. To resolve: 1. Restart computer, then, your computer’ll roll back to Windows Vista 2. Click start, right-click computer, and then click properties 3. on advanced tab, click environment variables 4. under system variables, click new 5. Type MIG_UPGRADE_IGNORE_PLUGINS in variable name field 6. Type IphlpsvcMigPlugin.dll in variable value field 7. click OK three times to close dialog boxes 8. start upgrade installation again, KB975253.