When I try to sign in to messenger, it pops up another
window which gives me an option to sign into .net.
However, the window remember's my name and not letting me
erase it - i.e. [email]xyzhotmail.com[/email].

How do i erase it. I have already tried going to
1. Internet Options 2. Auto Complete 3. Clear All
Passwords
but I am still not able to do so.
Please advise