Windows - explorer.exe problem

I have AVG internet security and tune up - I also have windows 10.  I cannot get into my Spodify account or into the Microsoft store - a message from:  explorer.exe pops up saying these programs can't be opened because "Class not registered"    Have my AVG programs caused this problem or had anything whatsoever to do with this?  I noticed I can purchase software from Norton anti-virus to fix this problem , but I don't want to introduce another anti-virus software system into my computer.  Any ideas how I can fix this?   Thanks, Adrian

Hello Adrian, 

We're glad to look into this & help you. We need to check whether AVG program causing this issue. 
Please follow the steps in this article (https://support.avg.com/SupportArticleView?urlname=Disable-AVG-Antivirus) to identify the AVG component that is causing the issue & let us know.
You can also share the screenshot of the error which you get in your PC.
Keep us updated.