Try re-registering the scrrun.dll:
Start > type cmd.exe in the "Search programs and files" box, then, under "Programs," right-click cmd.exe > Run as administrator
Then, at the command prompt, type the following pressing "Enter" after each line:
cd "%systemroot%\SysWow64"
regsvr32 scrrun.dll
Then close cmd.exe and restart the computer.
The process shows that it succeeded but the same script error is shown when opening msicuu2.exe as the administrator. I had even tried to open the installer in the Safe Mode but had the same results. The Windows Installer is shown as Start and Manual in Services.msc, it was Auto but I changed it with the results being the same.