Avg is preventing boot up

Hello Caroline, 
Thank you for contacting AVG Community.
We understand that you are unable to bootup the pc.
We are really sorry to know this. We'll certainly check and help you out.
Could you please share us the screenshot of the message you get?
It may also help us to diagnose the issue you are experiencing if you can attach a screenshot of the problem. If you are not sure how to make a screenshot on your device, please find instructions for a variety of devices here: | AVG (https://support.avg.com/SupportArticleView?l=en&urlName=avg-create-screenshot&q=screenshot&supportType=home)
Awaiting for your response.

When we suffered a power outage, the PC crashed… On attempting reboot into safe mode, the load fails at the avg file avgArDisk.sys. How do I solve this problem? I have access to the cmd line through the win 7 system recovery options

Hello Caroline, 
Thank you for contacting AVG Community.
We understand that you are unable to bootup the pc.
We are really sorry to know this. We'll certainly check and help you out.
Could you please share us the screenshot of the message you get?
It may also help us to diagnose the issue you are experiencing if you can attach a screenshot of the problem. If you are not sure how to make a screenshot on your device, please find instructions for a variety of devices here: | AVG (https://support.avg.com/SupportArticleView?l=en&urlName=avg-create-screenshot&q=screenshot&supportType=home)
Awaiting for your response.