Windows Solution: Windows Installer Service could not be accessed

What is a "surprise" today. My Windows Xp sp3 is crashed. The error message "Windows Installer Service could not be accessed" is appeared whether I am trying to install or uninstall a software. After doing some researches, such as reinstall the update package, check it registry etc, finally, the solution for my Windows Xp is just two steps with two command lines:

1. Click Start, click Run, type MSIEXEC /UNREGISTER, and then click OK. Even if you do this correctly, it may look like nothing occurs.
2. Click Start, click Run, type MSIEXEC /REGSERVER, and then click OK. Even if you do this correctly, it may look like nothing occurs, or you may briefly see an hourglass. After you run this command, the operation is complete.

However, there are more than three methods available on Microsoft Officer Website. Read more at the links below.

Written by: Xaivier Chia

Other solution:
Q319624
solution with photo guidance

Other resources:

Windows Installer 4.5 Redistributable

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