You cannot use MSN Messenger at this time because your contact list is not
available.
since last week, reinstall, different user still same...
MS servers are not down. Probably something is corrupted. Try this:
1. Start > Control Panel > Add/Remove Programs
2. Find MSN Messenger. If there's a button called Change/Remove, click on that and select Repair. If there's only a Remove button, click on the Click here for support information and click on Repair.