I have Avast Internet Security installed on my Desktop ( this machine ) and my Windows Surface Pro tablet.
Wondering how to have Avast find my tablet if it is stolen / lost, or will Avast help with that at all?
I presume that on your tablet you have avast! Free Mobile Security installed.
The first step toward having theft protection available for the tablet is to activate the Theft Protection.
To learn more take a look at:
http://www.avast.com/free-mobile-security