Way too many Random Guests. WTF?

[theFAILURE]

My forum from time to time will jump to as many as 200 guests (usually no more than 30-70).

We have found they come from domains that have no link to us at all.

We think that these "random guests" are infected with spyware or something that is making a pop-up show up on their screen, showing my forum.

They visit some random link, as far as one year old.

How can I stop these particular guests from coming to my site?

Screenshot below:

http://i3.photobucket.com/albums/y85/butch_driveshaft/random-guests.jpg

[theFAILURE]

I figured it out. 100% all set now.

It's called refferal spam.

Since I do not run Apache, I could not use .htaccess which would simplify the solution.

I could not block the ip with Windows IIs, because there were 1000's of ip's from teh refferal spammer.

We did it with some PHP code.

Thanks anyways :ermm: