Select Automatic from drop down menu If It is disabled. Click apply or Ok to changes take effect.
Click start button and try to install your desired software, It should fix the error. Let’s try Out the next option, if the problem still persists.
Use A Registry Script To Fix
Corrupt or missing keys in Registry Editor could cause this error. We can use a Registry script to fix Windows Installer Service error. All you need to do is download Registry script. Click here to download required registry script.
After download, Open the downloaded and extract .REG file using WinRar or any other file archive utility.
After extraction, Double click to open.
Click yes to accept.
Click OK to close. Hopefully, This will fix the error.
If the issue remains, then the next option is using command prompt. We can use CMD to Re-Register Windows Installer. Click start menu and search for CMD.
Open command prompt as administrator.
After opening the command prompt, You now need to type these commands one by one
Please restart your computer for the applied changes to take effect.
Download/Install Windows Installer
If you are still facing this error and can’t install or uninstall a program then the last option is downloading and re-installing the latest version of Windows Installer. Installing the latest version of Windows Installer will fix the problem for sure. For your convenience, the download link is here
You may use the comment to ask any questions If you run into any problem. I will try to help you solve your problem.