Yesterday my computer was taken over by Live Security Professional, a fake security scan malware. It wouldn't let me access the internet and kept popping up my computer was infected, etc. etc. I used my laptop to google this and it can be a big problem, I tried a couple of things that were recommended but it didn't work.
I thought I would have to call my computer guy but this morning I looked for more solutions and found a free download for malware called Malwarebytes Anti-Malware. I had to start my computer in safe mode, the instructions were there, to download it and scan my computer.
It took most of an hour and came up with 13 errors and I clicked, 'fix it'. I held my breath when I restarted my computer and HOORAY!! It did it, not more pop-ups and I am back on the internet!! And I just saved myself time and money on my computer guy, sorry, John!
I just thought I would throw this out there in case you have a problem also.