How to check for encryption viruses

Customer thinks he may have clicked on something (novice user)

How do I test to see if all is ok or not?
What Ap is particularly good?

I'm testing with trend micro house call now

Also is it a good idea to revert backward a day beofre if there is an all clear just to be sure to be sure ?

Thanks
feck1Asked:
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gilnovSystems AdministratorCommented:
I like Emsisoft's emergency kit: https://www.emsisoft.com/en/software/eek/

I think you'll find the command line scanner particularly useful in your situation because you can run it from a USB stick without having to install anything. Put it on a bootable USB stick, boot from the stick and run the tool for best results.

Reverting to a restore point probably won't help because many viruses delete all restore points. However, if you see available restore points, it's a good indicator that you don't have that kind of virus (but it doesn't mean you don't have another kind).
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feck1Author Commented:
What do you think of Kapersky rescue disk ?
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gilnovSystems AdministratorCommented:
I haven't ever used it so I can't give an opinion.
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