XP & Windows Messenger Query

[Bird Strike]

Question 1.

Is there any way of not letting 'Contacts" of Windows Messenger installed on Windows XP invade into Outlook Express?

Also is there any way of NOT letting Windows Messenger start when I start Outlook Express?

Question 2.

I'd like to get Windows Messenger to ask for password every time I start it. How do I do that?

Question 3.

If Question 1 and 2 are not possible, what's the best alternative to Windows (or MSN) Messenger?

Question 4

Failing all above, I have tried to remove the offending Windows Messenger from my system by using Add/Remove Program Windows Component whatever from Control Panel. It's still here though! How do I remove this offending material fully from my system?

The machine is Sony Vaio PCG-GRX3P.

Thanks for your help!