Firewall disabled

my AVG firewall is showing red. it says file and printer sharing disabled. it won't let me change any settings and when i try restoring to default nothing happens. when i try to reinstall i get and error.

description: General error (0x0643)
error code: 0xC0070643

any ideas on how to fix this?

Hello Joseph,
We apologize for the inconvenience.
This issue can happen due to failed update. Please try to run the AVG repair and see if that fix this firewall issue. Please click on this link for the steps to repair AVG avgclick.me/RepairAVG
Thank you