I'm sure many have heard of the program called "Trillian".
It's an Instant Messenger interface which supports the MSN, yahoo, icq, skype and a number of other protocols.
It's always had a fairly good reputation as far as I was aware, but it turns out they recently took up a deal with "OpenCandy". As part of this deal, they are now distributing Trillian with the OpenCandy32 Adware.
Also known as: "Adware:Win32/OpenCandy"
Or that is what MSE detects it as.
Basically, it's a piece of software that comes along with the Trillian installer, that delivers unwanted advertisements in places you will not want it to be delivering them to. And, you won't even get a choice about installing the stuff.
Basically, trillian and it's distributor are done and dead for as far as I'm concerned. Perhaps you've heard of the company called "Gator", which used to do the same with the software called GetRight? Well, this joke will kill Trillian as surely as gator killed GetRight.
I'll just stick with Pidgin for now.