Error message cmd exe is infected

[Guest]

Hello,I have a few issues that may be a result from the same virus. 1. Pop-ups from Anitvira pro???. 2. Control Panel will not let me "add or remove" programs. 3. I am unable to "Run" anything from the start menu such as "cmd" or "appwiz.cpl", etc. and my computer will not let me open the Internet to download a fix but it will open itself on porn sites and such. I ran a scan from Avast but it found zero threats.
Please help. My children need this pc for homework. I don't want them on mine as it is running perfect. Thanks
I have read all of the possible fixes however I

 

[tigsounds]

I don't want them on mine as it is running perfect

Gee, thanks dad.

Get Malwarebytes using your other computer, run on infected computer.

http://www.malwarebytes.org/

 

[hang-the-9]

This is from Facebook I'm betting, my daughter just infected my main PC a few days ago.

You will need to start the PC in Safe Mode, run Malwarebytes, make sure you do all updates for it. You may need to run it a couple of times to fix the issue.