Since the last two CIS Updates the task manager didn’t work anymore on my Lenovo Notebook, WIN7 64Bit.
When I tried to open it, it instantly closed again. Same issue with Killswitch and WinRar for example.
Thanks to Sysinternals ProcMon I managed to find out what is causing this problem:
It is Lenovo OneKey Theater!!
I uninstalled it and now everything is working fine!
Hope this is useful for you guys!