Well guys have seen theres much confusion on how to play NFSMW using Hamachi, so i'll clear everything up once and for all.
This is the basic guide with all files required to play.
http://www.hamachi-games.sk/old/index.php?page=69
Only the game creator is required to download the MW-Hamachi, those joining can just use the basic Hamachi proggy to join the game.
The MW-Hamachi prggy for the game creator has to be used together with normal Hamachi, as in have to run both together, cant just use the MW-Hamachi alone.
For people who want to create the game they have to edit their X:\Program Files\EA GAMES\Need for Speed Most Wanted\server.cfg
Open the server.cfg file with notepad and
Step 1 edit server.cfg
##------------------------------------------------------------------------
## DO NOT CHANGE ANYTHING BELOW HERE
##------------------------------------------------------------------------
TRUST=255.255.255.255
TRUST_MATCH=%%bind("5.x.x.x") put ure hamachi ip here
ACCOUNT=1
MASTER=1
SLAVE=1
REDIR=1
#
# This line allows the server to determine on what interface to listen for
# connections. It can be any publicly routable IP address (this is the case
# even if the host is on a LAN that is isolated from the Internet). There is
# no communication attempted with the IP address listed here.
#
ADDR=%%bind("5.x.x.x") put your hamachi ip here
Edit it to that and save.