I keep loosing my instructions for removing MSN Messenger from Windows XP. Sites like Experts-Exchange.com want you to sign up and pay for the answers. This site has the best page I’ve seen.
The short answer is WindowsKey-R (the same as Start->Run) RunDll32 advpack.dll,LaunchINFSection C:\Windows\INF\msmsgs.inf,BLC.Remove (Enter). If you installed Windows XP into a folder other than C:\Windows, edit the command appropriately.