Hi Felix,
Thank you for the update on the issue. I appreciate your efforts in resolving the issue. There might be corruptions in the Windows files or services. Try the following methods to diagnose this further and fix it.
Method 1: Run the System File Checker tool (SFC.exe)
System File Checker is a utility in Windows that allows users to scan for corruptions in Windows system files and restore corrupted
files. It will scan your system files and to repair missing or corrupted system files in Windows. To run the SFC scan, refer to the Microsoft article below.
http://support.microsoft.com/kb/929833
Method 2: Add a new user account
Try to add a new local administrator user account to test if everything is working fine on the new account. By this we can diagnose if this is an issue with the corruptions in user profile.
To add a new user, refer:
Create a user account
Hope the information helps. Let us know if you need further assistance with Windows related issues, we’ll be
glad to assist you.
Thank you