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When you try to install a program which uses Windows Installer in a Windows Vista computer, you may receive the following error.
The Windows Installer Service could not be accessed. This can occur if the Windows Installer is not correctly installed. Contact your support personnel for assistance.
This error may occur even though Windows is already in normal mode.
Resolution
Start the Windows Installer service
- Click Start, type Services.msc and press {ENTER}
- Double-click Windows Installer
- Set the Startup type of Windows Installer to Manual
- Click Start to start the service. Note down the error message if any.
- Click OK.
Windows Installer Registry Fix
If the above steps do not help or if the Windows Installer service is not listed in the Services applet, follow these steps:
- Download msiserver.zip and save it to Desktop.
- Unzip the file and extract msiserver.reg to the Desktop.
- Right-click msiserver.reg and choose Merge.
- Click Yes when asked for confirmation.
- Restart Windows.
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If your still having problems after Re-Registering, Re-installing and adding the Reg files etc then this is the link for you
http://helpdeskgeek.com/how-to/how-to-fix-the-windows-installer-service-could-not-be-accessed-error/
If you don’t want to read basically right click the RPC service (a dependency of windows installer) and go to Log On. If your log on is on Local system account change it to this account and vice versa. Mine was on this account and I changed it to Local and it worked!