Tiscali will allow you to have several email addresses on your account (can't remember how many). Why not try creating a new one?
Alternatively, set up another one somewhere quite different (Google Mail perhaps). Keep the spammy one for use when you're required to give your email address to commercial organisations, and the other one just for friends and family.
The great thing about a webmail service (like Google Mail) is that you never have to download your emails. They're all stored on Google's server. So if you have a crash, your emails and contacts are safe, and you can access them any time, from any computer, anywhere.
I think that you will have to set up using his computer, I can't see a way round that.If you want more email addresses simply add them. you don't say which version of Outlook but it is just the same as any new email.