Win ME is exactly as its name implies: Windows Moron Edition.
Even the newbiest newbie can't harm anything (at least, that's what those guys at Redmond tried to do 😉 ) but this also makes it impossible to use like a 'real' OS like Win2k. Worst thing is that ME is so enormously bloated and, on the system I installed it on, far more unstable than Win98 SE.
I'd prefer Win98 over WinME.