Hi Adrian,
Thank you for the update.
I suggest you to try the methods given below and check if it helps.
Method 1: Check if the Installer Service is running. To do so, follow these steps.
- press Windows + R and type “Services.msc” (without quotes) and press Enter.
- Double-click Windows Installer.
- Set the Startup type of Windows Installer to Manual.
- Click Start to start the service. Note down the error message if any. Click OK.
Method 2: Place the computer in a Clean Boot state and check if it helps.
A clean boot is performed to start Windows by using a minimal set of drivers and startup programs. This helps eliminate software conflicts that occur when you install a program or an update or when you run a program in Windows 8.1, Windows 8,
Windows 7, or Windows Vista. You may also troubleshoot or determine what conflict is causing the problem by performing a clean boot.
Please refer the steps given in the link below to perform a Clean Boot:
https://support.microsoft.com/en-us/kb/929135?ppud=4&wa=wsignin1.0
Applies to Windows 10.
Note: Please go through the section: How to reset the computer to start as usual after troubleshooting with clean boot of the Kb article to boot the computer in normal startup after fixing the issue.
Let us know if you need further assistance. We will be happy to help.
Thank you.