try it...
go to:
C:\WINDOWS\system32\drivers\etc\
and open the "hosts" file with notepad. Add the line:
127.0.0.1 pagead2.googlesyndication.com
and save the file. Clear your cache out and enjoy ad-less head-fi!
Feel free to find out all the other ad hosts on the net and block them, too, and share this information with whoever you can, but don't post it on head-fi ). Oh, and you didn't hear about this from me.