I think installing new OS X is premature at this time and should remain as option.
But it looks like you have problems with some 3D party apps.
What is https //vk.com/ ?
To test... Log in as Different user and see if it works to confirm my assumption.
You can also run the EtreCheck to get a report on your system.
And disable any app launching at start up in user profile log in items.
More investigation...
To find out what the Finder is doing use following in Terminal.
sudo log show --start "2018-10-26 13:45:17" --end "2018-10-26 14:45:47" --info --debug --signpost | grep -i Finder
Adjust the date/time accordinaly