Hello Guys/girls Help

i have Problame With my mirc.exe when i open that mirc.exe it work so slow even in 30secands Or above it opens i am so confused what happens with that my system info is

OS ------- Windows2000 NT SP4 Updated
Memory -------- 128
MSN
IE V6
Anti virus MaCfee updated

& Must mentioning thing is that my mirc.exe version is 6.17 not the the letest one coz i just don't like to use.....6.2
even i use 3 remotes on my MIrc script no else thing i use my HD is 20 GB
i hope all this INfo is Enoff to mention. & i re-installed Windows just 2 hours ago Due to this Problame But Still i have The same Prob i hope you people Help me with it Thanks.....
ReGards.