cannot get into PC

I just installed Avast Grimefighter, and now i am lost on my PC no1
All the time i get:

Reboot and select proper boot device
or inset boot media in selected boot device and press a key

How do i get into my PC

I’m having a very similar problem.

After scanning and installing the computer cant find my user profile!!! Is the same as not having a pc !

Boot and if you can select GrimeFighter, choose so.
Tell it to undo the changes it has made.

My computer went into sleep mode and now I can’t get into it. A vast grime fighter was cleaning and then it went to sleep. What do I do???

Use the reset or power button.