This is a major scam. He's good at tricking people, especially older people, into thinking he's there to help. He's persistant.  You can read about him here.  http://news.softpedia.com/news/AMMYY-Issues-O ... ms-288129.shtml
Note, he normally calls with caller ID of 767-275-9067 to spoof who he is, but you can sometimes get him to give you a call-back number but telling him your internet is down, or you need to change phones, etc.  Calls himself "Roger Williams", "Zack", "Jack", "Michael", and other names.  The website he tries to get you to go to varies as well.

This guy is a real low-life. I've just finished cleaning up his mess on a few people's computers (I do a lot of support) and I feel pretty bad for them.  This guy should really be in jail.

Said my computer was infected and took control of my computer, said korea was using my ip.  wanted to charge me $199.00 to fix it.  showed me on my computer, that i had 56000 infection.  

they are very help full.

Anyone who thinks your post is true should read the Microsoft website where there is a full description of this scam.  What it says is that no-one should follow any instructions given to them by a cold caller who says he has seen that there is a fault with your computer.  Microsoft say that no-one who calls knows anything about our computers and anyone calling like this is a scammer. This is what Microsoft say and can be checked out  by anyone reading this.

they are very helpful. I am very satisfied with their service.