Hi Martin,
Here’s what you can try:
Method 1: Check if the issue occurs in safe mode and perform clean boot.
Step 1: Check if the issue occurs in Safe Mode.
Safe mode is a troubleshooting option for Windows that starts your computer in a limited state. Only the basic files and drivers necessary to run Windows are started.
Follow the link below to learn how to do so.http://windows.microsoft.com/en-US/windows-8/windows-startup-settings-including-safe-mode
Step 2: If the issue doesn’t occur in Safe Mode, then proceed to Clean Boot steps given in the link below.
To help troubleshoot error messages and other issues, you can start Windows by using a minimal set of drivers and startup programs. This kind of startup is known as a "clean boot." A clean boot helps eliminate software conflicts**.** Here is the link for your reference to perform clean boot.
http://support.microsoft.com/kb/929135
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.
Method 2: Install all available updates in Windows Updates and check if the issue is resolved.
Follow these steps to do so:
a. On the desktop, press Windows key + W and type Windows Updates.
b. Click on Check for Updates and install all available updates.
Check if the issue is resolved.
Method 3: Run the System File Checker tool
The sfc /scannow command scans all protected system files and replaces incorrect versions with correct Microsoft versions. When the scan is complete, the System File Checker tool indicates whether integrity violations were found. If integrity violations are found, the System File Checker tool lets you fix the integrity violations
**a.**Type Command Prompt on the Start Screen.
**b.**Right click on Command Prompt to select "Run as Administrator".
**c.**Type: sfc<space>/scannow.
Note: SFC scan may take a while to complete.
Please get back to us with the results.
If you have any further questions regarding Windows operating systems, please contact us on this forum. We are happy to be of assistance.