I dont run any Virus scaners but i am VERY careful of whta i open and look at
Going online without anti-virus protection is asking for trouble. I suggest you get AVG Free & install it immediately, if not sooner. http://free.avg.com/gb-en/download?prd=afg
I don't think anti-virus software would have detected this one. Internet Security 2010 is malware. A scan with Malwarebytes will usually do the trick. Make sure to get the latest updates before running the scan. http://www.malwarebytes.org/