While trying to install MS Office 2010 Professional Plus got an error which says "Error 1719- The Windows Installer Service  could not be accessed.This can occur if you are running windows in safe mode,or if  the Windows Installer  is not correctly Installed."

I have uninstalled all the previous Office 2010 OOBE set up from the computer and then tried installing it back from the set up file still it gave the same error.Also restarted the Windows Installer service nothing happened.Activated the Super Admin Account in windows 7 and then tried to install it however still was getting the same error. After about 2hrs of struggling with the issue then ran the MS FIx it to completely remove the Office 2010 from the system(ref-http://support.microsoft.com/kb/971179).

Then this Registry modification got the issue resolved.

HERE IS THE FIX THAT WORKED

1. Go to Start, then type regedit           

2. Go to HKEY_LOCAL_MACHINE\SYSTEM\CURRENT CONTROL SET\SERVICES\MSIserver

2a. Go to WOW64      (located on the right plane)

3. Right click on WOW64, then select Modify      

4. Set Value Data to 0 (mine was set at 1) and Base should be Hexadecimal       Close everything, reboot and then tried installing. Worked as a Charm!!!

After you finish, don't forget to go back and change the value back to 0 if it is not automatically changed.