Tracking Cookies

My OS - Vista Ultimate. I don't know if this is the right forum for this
question.
If not I'm sure someone will be glad to tell me where to go.;-)
I am using Windows Defender, SpywareBlaster, Spybot S&D, and AdAware
Personal.
I use IE 7 and FF 2.0.0.3
(all software is updated daily)

When I do a scan w/AdAware, I get 6 entries for:
bchat@live365 - tracking cookie - data miner - IE cache entry
live 365 seems to be an online radio service, that I do not use.

Is there a way to find out what site ''plants'' the cookie?
I'd like to stop it since it is the only thing appearing in the AdAware
scans.

Any ideas appreciated.
Happy Easter
(pretend this post about eggs, not cookies)
BChat