Shoutbox

Hi everyone well everything is fine when msn is not open but when i open msn my whole computer seems to slow down heres and example. When i click on the start button its like forever untill it comes up then just say i went to programs the same thing happens. I have noticed that this only happens when Messenger Plus is installed.I use to have msn 6.2 with Messenger Plus 3.25 and that slowed down my computer the same thing happened when i got msn 7 beta and Messenger Plus 3.40 beta. i have windows me, 1ghz pentium celeron and 128 mb or ram please help me.