He did get it from Kazaa.com.
So he got the one full of adware and spyware.
He should get the Kazaalite version.
http://www.kazaalite.tk/
dov,
If you want to just block their start page do this:
Open your HOST file (you will have to choose to open it with notepad)
If you use Windows 95/98 or Me you can find it in c:\windows\
If you use NT/2000 or XP you can find it in c:\windows\system32\drivers\etc\ or c:\winnt\system32\drivers\etc
Then add this to the end of the file:
Now those domains will be blocked. You will be routing them to "localhost" (your own puter) and that should kill the javascript errors.