A friend of mine is also having trouble with the fake security centre pop up virus, I have had the problem before and managed to fix it by removing it by using firefox and downloading AVG. However she does not have Firefox or any anti spyware programs, everytime we try to open task manager it quickly closes it again, and we cannot get on the internet at all despite there being no problems with her internet connection. I have so far not been able to get AVG on her computer using a removable device.
I've trawled the internet trying to find a solution, if anyone has any help or suggestions it would be very much appreciated. Thanks.