I'm giving a lecture in stupidity not because I feel like being mean or nasty, purely because I hope that it might get the message across to be more careful about this sort of thing in the future, if it's any consolation my father fell for a similar scam and I ripped into him for being stupid too, so don't take it personally, but please think a little more in future and take the attitude that everything is a scam until proven otherwise, rather than the other way round.
As I said the first thing you really should do is get that computer disconnected from the internet so nothing personal can be sent to anyone from it.
Once you've got it isolated you should run a full scan with your normal antivirus software, and while that is running use another computer to download malwarebytes
http://www.google.co....CcbRtv35zZEPzufAl4Q4Q
Put it onto a memory stick or CD and then install it on the computer you suspect is infected from the memory stick or CD (if you use a memory stick format the stick straight after you've done with it)
Once you've installed run it and run a full scan with malwarebytes too and remove anything it find on completion. do a restart on your computer and hopefully it will have found and removed anything it finds and you'll be clear.
If it doesn't find anything, or if it won't even install or run for any reasons then you problem becomes a little more problematic and a full scan in safe mode, or an offline scan using a bootable scanner be be required.