Netmeeting, messenger, HOTMAIL issues!

We have sveral 95, 98 and w2000 workstations.All are running EI 5.5 or above w/128 encryption. No proxy server. No 3rd party blocking software. No firewalls. Some (both 95 up to w2000s) can not log onto hotmail.Others can. I have the same settings on all. The message says (ENABLE COOKIES)The problem is… cookies are enabled on all.
In security and INTERNET and in custom…all cookies etc are enabled. EVERYTHING in explorer is the same on all machines.
What else could we look at??????