Quarantine problem

Hello Joerg,
We are sorry to know that. To assist you better, could you please send us the screenshot(http://avgclick.me/getscreenshot) of the error message you get?
Thank you,
Karthikeyan, AVG Customer Care

There are 2 items in quarantine. If  I try to delete them , I always get the massage: Invalid connection 
How can i delete them?

Joerg, For your info, just in case that you are unaware, you can post the screenshot here in your topic. Click on 'Answer' & then click on the 'Image' [mountain symbol] & follow the instructions. 
AVG Guru

Hello Joerg,
We are sorry to know that. To assist you better, could you please send us the screenshot(http://avgclick.me/getscreenshot) of the error message you get?
Thank you,
Karthikeyan, AVG Customer Care

Hello Joerg,
Please provide us with necessary information using the instructions provided below so that we could analyze the issue for you.
Click Finder icon in DOCK.
Select “GO” option from the menu bar and select “Library” option from dropdown list.
After getting into Library location, we should be able to see the logs.
System logs: /Library/Logs/DiagnosticReports
User logs: ~/Library/Logs/DiagnosticReports
AVG System logs: /Library/Logs/com.avg.Antivirus
AVG User logs: ~/Library/Logs/com.avg.Antivirus
Alternative option:
Go to “Go > Go to Folder…” (Shift+cmd+G) option
Thank you.

You are always welcome.
Thank you for replying back.
We are happy to know you were able to reinstall OS X and then recover the data using the backup disk.
Thank you for showing interest in purchasing AVG Internet Security.
If you wish to use AVG Protection for Mac then please purchase the AVG Internet Security Unlimited devices product.
To know more about the product please have a look at the official website: http://www.avg.com/internet-security .
If you need assistance with the purchase then please contact our sales support: https://support.avg.com/support_sales_chat?l=en .