Yes internet working fine in Firefox(default) and IE11.
Fibre optic ethernet connection dl 75mbps ul18 mbps aprox.
Not sure what MVPS files are,and i'm not aware of having any.
In settings>Troubleshooting
Could you change using Chrome as default browser in safezone (saying it from back of my head, might not be accurate)
In settings>Troubleshooting the only chrome option is to check a box to disable under
the title of "Do not use Chrome as Avast! default browser"which i have got unticked.
If that didn't fix it for you, I can't seem to think what the problem could be...
I think in my personal investigation of avast the problem is the avast storage problem and also avast cannot write in it's own sandbox i have thoroughly search from the registry,system files,avast logs seems to be true. I really think it's permissions problem in the system,administrator & users so avast can't really write,modified and altered it's own sandbox folder. Even if you use all kinds of clean uninstall or reinstall and any other antivirus cleaning tool such as avastclear,rejzor uninstall tool,etc are all useless i had try it all but all of them didn't work. This problem occurred to my netbook when i updated to avast 9.0.2018 now avast safezone and avast sandbox aren't working btw i am using avast premier. This issue didn't occur on my father desktop even he updated to latest version without using clean uninstall. The only way to fix the problem is to format the hdd/ssd where you install windows and where did you place avast folder and it's sandbox folder but that solution is so time consuming from backing up the data to another hdd/ssd.