Very true, GtW - but that may require more computer knowledge than the new customer possesses.
I've lost count of how many folks have asked me to help them set up their broadband or (more often) to get it to work properly. I keep a little spreadsheet in my batphone with the settings for the ones I've done - so next time, I know exactly how they work.
It includes such silliness as:
"What's the name format for the ADSL login?" It rarely seems to be the same as your "account name".
"Do you put the domain name after your e-mail ID to collect your mail?" Some do, some don't.
The "ISP install disk" knows that stuff. It's just a pity most ISPs can't resist the temptation to put other junk on at the same time.