don't click on it and don't even click on the X to close it because this rogue program usually installs the virus on your computer. Simply unplug your computer and reboot and hope the window doesn't pop up again.
I just went through this the other day, The Norton tech told me when you click the X you are giving permission for the software to download, basically an executable fie (EXE) the more you try and close it the stronger it gets.
They told me that you can close a suspicious window or pop-up by hitting keys; (Alt F4), that prevents the hijack.
I had it bad, some kind of fake windows security update, couldn't even go online, they had to talk me through a tricky work around to create a new user account just to get on line, then they did the remote access thing, it's pretty cool seeing them work on your computer from the other side of the world.
Costs $99. but worth it when you really need it, like I said I couldn't even get online so that free site would not of helped.
I asked them why I should have to pay since I have their Internet security package, but they said when you click on an executable file they can't stop it?
This type of virus is not about just causing you aggravation, thought up by some mischievous geeks. This is a well organized attempt at large scale identity theft.
JB.