A few thoughts.

No one program (paid or free) is capable of finding all A-V attacks, all the time. That is why many of us use a secondary A-V to backup the main program. But, two A-V programs should not be running at the same time as they can conflict with each other and really slow your PC down.

"Ad-Aware" is an anti-spyware and anti-virus program which has been used and proven for a long time but is falling out of favor as newer programs keep coming.

"AdwCleaner" (the one I recommended) is a French program that removes unwanted and intrusive adware, PUPs, toolbars and browser hijacks and is continuously updated 2 or 3 times a month. It isn't an anti-virus program per se.

"Hijack This" is another good program to compliment "AdwCleaner" but it should only be used by someone who really knows what they are doing.

"AVG", just as all anti-v, anti-mal programs, can be subject to false positives which are corrected for in updated data files.

Many virus and malware programs use file names that are similar to existing, safe programs, to hide themselves from easy discovery. Some may even use system file names like explorer.exe to hide.

Where did "AVG" find these positives that it cleaned or quarantined? False positives can exist in the stored files of your browser travels... they may not be a real threat but only a reference that is treated as such.

Download AdwCleaner, a free program at: https://toolslib.net/downloads/viewdownload/1-adwcleaner/ to your Desk Top.

Dble left click to open the program.
This is not a permanent install, it uninstalls when you are finished.

Click Scanner to search your computer.

When done, click on each tab to see what malware or listing it has found. and click in each box for malware removal.
If you choose to keep or are unsure about a file, uncheck its box.

The last tab to the right (after FireFox) is for Chrome.

Click "Clean" and reboot.

You may have to go back into Chrome's settings to re-set the "On Start-up" New Tab Page and "Search" to Google.