[John Rogers]

Oh my, sorry I rambled on so much and some went over your head. What I'll do is to make each step and write what to do. Before I retired I was a very senior Oracle Database Administrator and we had a staff of 24 to 26 programmers here in San Diego and about 250 over in India mainly since those poor guys and women worked 12 hour days, 6 days a week for a fraction of what us USA based folks were paid. When I retired I was making $140,000 or more a year and the fellow in India who I turned things over to was paid $16 and hour!!!!

1. Disconnect the LAN cable (hopefully NOT wireless) and then boot the PC in SAFE MODE. This means pull the RJ45 connector on your computer. Then shutdown and restart it, not the auto type but depending on your brand a hot key(s) will allow how to boot. You can check using you iPhone or whatever you use and it can be a small screen search engine for you.

2. Use the log file from your anti-virus software to see the name of the bad stuff which it sounds like you know what the name might be. The location of these files is available in the setup or properties of the anti virus software. Once you see the offending file, look to see where it is with regular old explorer app and look at the properties (right click) as it will be write protected then use the shell run as ADMINISTRATOR and change the ownership to you.

INFO: Hopefully this is NOT in the boot sector or other location where Windows keeps those thousands of OS files. If you can wipe it in the shell (command window), make a recover thumb drive if not done already.

3. Then boot up normally BUT NO LAN CONNECTION which of course your computer will not like at all then if the anti-virus is happy try to reboot this time with LAN connected to see what is up. At this time you can use the info provided above to look at what is running AND who the userid or owner is and if it is NOT you, get rid of it as noted above. If no errors plug the LAN RJ45 plus back in and the PC will see your router in a minute or so, mine takes about 1.5 minutes as the OS is thinking I guess.

4. If no errors or unusual programs, pull up your administration screen of your LAN/router/firewall to see what is connected (should be done weekly) and if anything you do not recognize delete the connection to see if anybody in the house is hollering!

5. Lastly a great idea is to write the name/MAC address of EVERY smart TV, printer/cell phone or any other device using your network. Save these in a note on your phone so you will have a reference. You can use most modern router administration screens to EXCLUDE ALL MAC addresses except yours that are needed.
If you do not know how to do this the router software or manufacturer website help area will give instructions on how to do it. Write everything down in case you have to back up a step.

6. Lastly +1 remember to change the name and password of your router at least yearly AND do NOT use anyother userid or password.

Good luck. I and others back in the 90's when I was teaching computer science classes we always had an "Intro To Computers" class which covered things like this but after 2000's or so the new students all felt thay did not need this geeky stuff but here we are!
John Rogers