Are you trying to share on the same LAN or through the Internet. If you are trying to share through LAN, use NetMeeting. That way you don't need any of those third-party messengers, you can just go from one computer to another and send the files through a conversation. Or the feature I use most on NetMeeting is Remote Desktop Sharing. It doesn't download files like AIM does, but you can control other computers that have NetMeeting Remote Desktop Sharing active. Hope this helps.