This is a scam. A friend of mine just posted the recorded conversation with these guys (pretending like he was falling for the scam). It's a good listen if you need a laugh (or to educate yourself not to fall for such scams).
http://soundcloud.com/bartek-kujbida/virus-scam

I just got a call from these guys.  Just for fun I went through the steps up to the point where he wanted me to allow remote access to my computer, after that I just shut him down.  It was fun stringing him along.  Listened to the phone conversation from the previous poster's link, funny as hell.

im not sure who keeps harrasing from this number

I just received a call from 3122638166. The other number is 5167469209 He stated I was going to get free grant money. ANd that he needed my credit card number of only $3.87 to get the user id, password so I can get the free money..

living in the netherlands, and got a call on my cell, weird!