Hmm - usually i say delete autosaves and save games, but strictly speaking you shouldn't get that far.
Are you running firewall software? Cause that can stop you connecting, not sure about causing crashes though....disbale firewalls and check the relevant ports have access (run FLdirectIp or something its called in EXE folder - it will tell you what port) - make sure that aint blocked off etc
You might have some corrupted files on the CD or something - best thing to do is UNINSTALL fl first, then reinstall - as this gets rid of any old files from FL (including save games) - then try again.........after that - its corruption on the CD