"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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