How to Remove Windows XP's Messenger?

Open Windows Explorer and navigate your way to the C:\windows\ INF folder.
In the INF folder, look for sysoc.inf.
After creating a backup of this file. Open it in the notepad.
Look for the line containing "msmsgs" in it. Near the end of that particular line, you'll notice the word "hide".
Delete the word "hide", leving the quatation marks empty i.e. "".
Save the file and close it.
Open the Add and Remove Programs from the Control Panel.
Click the Add / Remove Windows Components icon. You should see "Windows Messenger" in that list. Remove the checkmark from its box, and you should be set.