Windows Live sign in problem

SO.

i try to go to a site that uses a windows live ID. It works fine on this computer but when i try to sign on on my dads it does some weird stuff.

First, when i type in my email and password it tells me that i typed in the wrong password. Then i type it in again and it signs me on. But as soon as i go to another page it signs me back out.

I tried changing the cookie settings but it doesn't seem to work. also using different browsers but nothing.

I saw a couple of posts about Windows Live Messenger or something. Do i need to install that on my dads computer? (not sure if its on either.. sounds like it should be on both)

 

so i deleted all the cookies and temporary files and installed Windows Live Messenger and it still won't let me sign into the site.

It won't let me use any other MSN email i have either...

I would greatly appreciate any help you guys give..