It has come to my attention that this site is infecting PCs, at an alarming rate, with spy-ware and adware. Many of my "less PC tuned" friends keep popping up saying they use this site www.block-checker.com to find out who is blocking them.
I urge everyone not to download their software. It says it is spyware free which is complete bs. I have been fortunate enough not to fall trap to this but my friends have. It seems Spybot can't even pick this biatch up. If anyone does send you a link to the site (through any Instant Messenger) linking to this site, it usually occurs the second you log on, as the software mesages you (without users permission) a little message containing the link.
If you do get this message I urge you to tell your friends they are infected, as this is nasty stuff. Many do not even know the message has been sent, so are none the wiser. I'm not 100% sure, but it seems uninstalling MSN Messenger (including any add-ons you have) and re-installing is the only option. BUT, that may just stop the messages, the spyware could still be on there. Until I know more, i would stay clear of this site.