when i try to open the cmd.exe. a box pops up with the message of cmd.exe error windows 7 the application was unable to start correctly (0xc0000142). Click ok to close the application. my pc was infected with surabaya virus and rootkit and removed it with Avast free anti virus and malwarebytes, spybot, but after this i am unable to open some files like windows defender and some system files.
I have read this began for some users after a Windows Update in Nov 2014. It seems to be a conflict with Geforce Experience (Nvidia graphics cards) and the Win Update. Uninstalling Geforce experience has worked for many people. Perhaps Nividia are aware of the issue and have released a new driver by now - worth checking.