If you want to disable MSN: From a newsgroup post: "See ME302089
. Go through the applicable steps, except when choosing 'Do not allow Windows Messenger to run', be sure it's set to Disabled. If you used the registry method (the last method listed on the page), instead of setting a 'PreventRun' DWORD, delete it (as above with the Hide Messenger DWORD). You will need to reboot to see the change.
Just for clarification, Windows Messenger is not going to "go away".
From a newsgroup post: "A number of people have indicated that by deinstalling the NAT patch for the PC2Phone features, helps solve this problem. To try, click Start, then Control Panel, then Add or Remove Programs. Scroll down and locate 'Windows XP Hotfix (SP1) [See ME316397
information], click it, then choose Change/Remove and uninstall."
From a newsgroup post: "In several newsgroups many people have lost connection to messenger in
windows XP. Here is the solution i found after having lost my messenger XP:
Run gpedit.msc from start menu. In this group-policies program you can set the missing parameters for messenger XP. It worked fine for me after a virus-cleaning."
Another newsgroup suggestion is to reinstall MSN.