Why cant I download msn messenger?

I have had it before, but somthing went wrong with it. so I got rid of all the MSN related crap. and thought i would download it again and it would be fixed.

Now its saying it cant re-install messenger because i already have it, but I dont!!
Im realy confused!! how can i get it back??

thanks for any help...

also it says msn cannot be installed on windows server, because im using Windows XP pro x64 or a service pack earlier than XP service pack 2

it's not your system.

Here's the word quoted from Micro$oft:

"We have encountered some problems when deploying an updated release and the service is at the moment down. We are working to solve the problem and we expect to be back online in the next 24 hours. We apologize for any incovenience this might cause.

Federico Raggi. Program Manager / Windows Live Developer Platform / Microsoft"

Start>Control Panel>add remove programs>add remove windows components>Windows messenger.
That messenger will be installed, then you go to msn site and update.

Added:
Yeah I found out why it does not install on Server class Windows.
Go there:

http://www.techspot.com/blog/129/how-to-...

Download:

http://www.softpedia.com/get/Internet/Ch...