Computer stuck reverting to previous software

[cneuby]

Downloaded sp2, grandson hit a power switch during update, now computer will not revert to previous version (over an hour)

 

[ksiemb]

Downloaded sp2, grandson hit a power switch during update, now computer will not revert to previous version (over an hour)

Try a repair Installation: http://windows.microsoft.com/en-US/windows-vista/What-are-the-system-recovery-options-in-Windows-Vista