You can easily fix the Avast error code 7005 on Windows. First, turn on your computer system and then log in to your system as an administrator. Click on the Start option and go to System restore. Select the option to restore my computer to the previous time. Click on the Next and when done then create a restore point. Confirm all the changes that you have made and then restart your computer. To fix it on Mac, turn on the Mac and login as an administrator and then click on the start button. Find System restore option under the Accessories option and open it. Once the new windows pop-ups then select the option to ‘restore my computer to an earlier time’. Confirm all the changes you have made and then restart your device.