Jelly

I have both Windows Messenger and Windows Live Messenger programs on my
computer.
Are they basically the same type of program?
If so should I uninstall one of them?
If so which one?

I have never used Windows Messenger (version 4.7) and don't know how.
I have used Windows Live Messenger (latest version) for instant messaging.
I suspect that it occasionally freezes up my computer. Maybe because I have
both programs installed.