You may want to connect directly to the router via ethernet to isolate if it is a wireless issue. Also OS9 is going back in the day and even an old iMac should be able to use OSX which will be better supported.
Can you confirm which mac you have?
This will allow people to have a better grasp of what the issues maybe as at the moment they are a little vague. Also friends don't let friends use IE. It's bad.