Social Bookmarking warning .. possibly

I have just spent the last 10 hours trying to recover normality to my laptop.

So what happened ? I decided to use "social bookmarker" website to submit my pages for bookmarking, after signing upto some sites and then moving onto the next through the social bookmarker window I suddenly had a never seen before pop up window that would not go away telling me my system was in serious error and I needed to pay 47 dollars to get rid of them before I could do anything at all with my PC.

The only way I finally managed to get rid of this was by starting my machine in one of the safe modes and pulling up the offending newly installed program up with Notepad and deleting some of the code.

Note, I didnt delete all of the program because I had tried doing this numerous times but it always reproduced itself so though why not try and just mess the code up so it reproduces messed up code, seemed to work.

I was then able to start my laptop up in normal mode and access internet, downloaded "spybot, search and destroy" and then spend 3 hours doing re-runs to clean my machine.

Laptop is still not 100% right and I might have to do a factory restore soon, so word of warning, make surall your anti-stuff is right upto date.

Pretty sure it was downloaded through social bookmarking through social bookmarker, I checked the install date and time of offending code and it tallied right up with me shutting one of the windows down earlier today.