I got this problem after updating to Windows 8.1 Update 1. If I start my PC after Windows Shutdown, I can't start any program or do anything(incl. shutdown, restart or anything). My desktop loads and I can open the metro screen, but I can't start any program or do anything.

I tried to power off my PC instead of shutting down and everything works fine untill the next shutdown.

What can be causing this or where can I check logs or anything?

Thanks in advance!