I close my browser and there are three windows behind it?
Most real antivirus do not install themselves, and then ask for money to clean them off.
If you think you have been infected, here are a couple of things you can try.....
- Download Malwarebytes AntiMalware from Here
- Go to housecall.trendmicro.com and run free scan.
- Get an antivirus like Vipre (GFI Software) 15 Day Trial
Make sure any program you use < Click Update > first.
If these find something, but you still have problems get help, some virus's are near impossible to remove completely.