Today as soon as I downloaded mIRC, Security Essentials popped up alerting me of Adware:Win32/OpenCandy. I thought it might have been scanning in the background and detected something coincidently, but looks like it detected mIRC as Adware:Win32/OpenCandy!
I am a long time mIRC user and am very much aware about the script support by the software and how else the IRC chat client can be used for malicious purposes. I trust mIRC, and the risk level was shown as medium, so I allowed it in Security Essentials.
There is an official explanation about this whole thing on mIRC website www.mirc.com.
I went ahead with the installation expecting to see an 'offer' to install something, but didn't see anything. It got installed as usual. Maybe I'll be asked to open the candy when the trial ends 😀