yes i definatly suggest disabling the firewall built into xp cause for me i actually couldnt stay online for more than acouple hours at a time till i disabled mine ..... mirc and everything including msn messanger would go offline for a moment and then try to reconnect ..... sometimes it would take till i timed out and didnt realize i was disconnected ...... but other than that ive had no issues with xp pro running mirc at all