Windows 7/8 - restore default task manager?

Delete the registry following registry entry:

HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe

Just tested it with process Explorer. The entry doesn't exist on Windows 7, unless I select "Replace task manager" within Process Explorer.

I followed the instructions in this post and I'm back to stock now. So it was sort of a two step process,

1. Uninstall Process Hacker

2. Then run Process Explorer and do the replace task manager option twice.

Uninstall Process Hacker and get the portable version, this will not replace the default Task Manager.