Casey, welcome…
Which is your operational system? What do you mean by ‘cannot move it’? Does the slider does not move or you can’t save the changes after boot?

Can you try to repair your installation?
Go to Control Panel > Add/Remove programs > avast! antivirus > Remove
Then choose Repair function in the popup window (Repair).
You must be connected to the internet while repairing.
If this does not help, can you uninstall / boot / install / boot again?