"The Windows Installer Service Could Not Be Accessed" error when you try to install a program in Windows 7 or Windows Vista

"The Windows Installer Service Could Not Be Accessed"


Windows key+R , in the opened Run... window type regedit

In Registry Editor, navigate to:

HKLM_System_CurrentControlSet_Services_MSIServer

then change the ImagePath value value to:

C:\WINDOWS\SysWOW64\msiexec.exe /V

Close registry editor,

Press windows key and type cmd  in search. when cmd opens copy the below  location

C:\WINDOWS\SysWOW64\msiexec.exe /regserver

Press enter  and Reboot

After rebooted, everything worked again! (It didn't work before reboot).

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