Greetings,

OE doesn't take up much space nor cause much pain, but if you want, you can kill it.

There is no product called "Net. Messenger" -- what you're thinking of is Windows Messenger.
You can remove Windows Messenger, although there are a few components in Windows Live
Messenger on XP that depend on its existence, namely Remote Assistance, Whiteboard and
Application Sharing.

That being said, you can remove Windows Messenger by clicking the Start button, then click
Run and enter:
RunDll32 advpack.dll,LaunchINFSection %windir%\INF\msmsgs.inf,BLC.Remove
Then click OK.

If you ever need it again for the components discussed above, you can always reinstall it.