System restore is the best option for now:
Log on to your computer as an administrator.
Open the Control Panel by clicking Start, and then clicking Control Panel.
Click System and Security, and then click System.
Under the Control Panel Home menu, click System protection.
If you are prompted for an administrator password, type your password. If you are asked for confirmation, provide confirmation.
Click System Restore.
Choose a restore point.(Make sure its not on 21st of feb or may go back to a state where avast deleted your files)
Click Next, and then click Finish to confirm your restore point.
To start the restore process, click Yes.
Once the system restore is complete, your computer will restart.