Answers:
Same as until that time, no change want to be made.
If you enjoy problems though, stir to tools option, later from skylight click advanced /firewall and label sure that UPnP is checked.
And why you remove firewall? At tiniest if you use Windows XP SP2 initiate window firewall, it bloock just incoming traffic, butat lowest possible this style you will be protected from trojan or other nasty try to realize your PC.