greendot with no networking

I need help with the in-laws PC.  They are getting a screen that says something about green dot and FBI.  I tired to run safe mode with networking but the PC automatically reboots.  I have my laptop available to download files and load via thumb drive.

 

Any help is appreciated. I believe they are runnin norton anti virus  After the last sc**bleep** i got them out of!

 

Thanks!