I had this exact same problem and I have a quick solution for those looking for one. I want to share so others can avoid the pain that AVG support caused this poor guy.
1. I uninstalled all AVG products to see what further damage would be done. Further damage was done, but dont worry, it will soon be undone.
2. Optional: I downloaded a fee program called "fix shortcuts" which did fix some problems but not all. I simply used this program only to see what programs had been affected (thier pathways were corrupted and the exe's would not execute (they were broken) even from the program's directory which containis the main exe).
3. Find your broken programs on the internet and reinstall them. You might think that you will lose your personal information and settings this way but, in fact, you will not. The programs will sense the broken registries and short cut and simply repair them, they dont really reinstall but repair. I know this be cause when they install they take far longer and show you progress bars. In this case they will hardly seem like they ran at all. Then try your origional exe's, they will work 
And all your stuff will stuff be in place.
At the time I was making a full stack development program and had just finished, before I uninstalled AVG tuneup as well as the VPN. This 'reinstall' fix repaird everything so that its all working and communicating agian.
My experience troubleshooting this with support on the phone was horrendous. I wiated 45 minutes to talk to someone I could hardly understand, who hung up on me after I rejected the notion that this "has never been seen before" as they tried to put the blame others, or on me and my computer. At the time I was staring at this thread and others and told them so. I've left AVG's services and am never looking back, all you need is windows defender and some anti malware programs to be safe. Registry clean up services are a scam, look it up if you dont beleive me.
Seriously upset customer,
Jessica Kilbourne
Hello Abdulaziz.
We're here to help. Please note that the changes made to your PC by AVG TuneUp will be undone when you uninstall the application. We believe the issues are caused due to some other reasons. We'd request to try system restore feature to roll back the settings to a date where everything was working fine. Or contact Microsoft support for further help.
I used Tuneup for few months before I uninstalled it. Afterward, every application or program I used while Tuneup was installed is no longer lunch. Instead, I get an error message that indicates windows could not find the right path. The only solution that works with me now is to search the registry of that specific program and delete it. Is there an easy way to reverse the damage caused by Tuneup?
Dear Avinash.
I am sorry, but I do not appreciate your attempt to blame others. I know for fact that Tuneup was the cause of my issue, and I am simply asking the community if someone figure out a fix to my problem. It is okay to not answer at all if you have nothing to add.
Hi Abdulaziz,
We can realize your situation and sorry for the way you feel.
An e-mail has been sent to you with complete set of steps to connect with us remotely. Our technician will check what has happened and provide you with a solution.
If the e-mail is not found in your inbox, do check your spam/junk folders as well.
Thank you.