we did something similar on a server - if you log onto one of the pcs and then configure the updates the way you want them within the AVG console.. then on that machine look for a file similar to this

C:\Users\All Users\avg9\Cfg\sched.cfg (this was windows 7 machine hence c:\users)

You should be able to copy that .cfg file via a kaseya script to all the machines and it will change the update schedule. We set our servers to update once a week as they were updating all over the place and sometimes it would screw up the server...

you can test it manually by making the changes and then just copy it via windows to another machine and see does it work - you should see the changes immediately in the AVG console on the other pc.

I found C:\Users\All Users\avg9\Cfg\sched.cfg however when I open it in note pad it's all garbage.  How are you editing it?

you don't edit the file - that file is created by AVG when you configure the updates within the AVG console.

so open AVG on the machine - go into options or settings (not sure what its called then go to the update section and setup the schedule - So every wednesday at 2pm or whatever. Then close AVG.

That file will then contain all those settings - you then copy that to another machine and those same settings should appear on that machine.