This is from my iPad my computer must be infected need help!?

[CrossIdentify]

I'm getting porn popups, fake antivirus alerts, etc etc and I don't k ow how to navigate, when I open internet explorer it brings me to weird pages I can't exit I use windows 7, how can I restore my pc to. An earlier date or fix it

 

[AdamD]

Buy an antivirus program. If it doesn't help, reinstall your OS.