Hi Ben,
Thank you for in interest in using Windows 10 Technical Preview.
Sorry to know that you are facing some issues on the new Operating System. Let me try and assist you with the issue you are facing.
You might face this issue if the Windows updates and drivers are not updated or if some system files are corrupt.
Follow these methods:
Method 1:
First, let us run the System File Checker tool (SFC.exe) and check if it helps. The System File Checker tool (SFC.exe) scans for missing or corrupted system files and repairs them.
Run System File checker to see if you have any corrupted system files.
Use the System File Checker tool to repair missing or corrupted system files
http://support.microsoft.com/kb/929833/en-us
(Follow Windows 8, 8.1 section).
Method 2:
I would also suggest you to install all the latest Windows updates and also the latest device drivers.
Download and install drivers
http://windows.microsoft.com/en-us/windows-8/all-drivers
Method 3:
Run the
Apps troubleshooter. This tool can automatically identify and fix some problems with apps.
Let us know if it helps. If you have more queries, we will be happy to help.