security advice

["coder" <elite.coder () ntlworld com>]

Hi I just need a bit of advice,

I have recently been appointed network administrator at a charity.
The network consists of a windows server 2003 central server
and about 10 windows XP clients.

can anyone give me some tips to secure the network?

so far I have:

> installed patches and updates
> changed passwords to "strong passwords"
> installed AV software on all clients & server

I am also planning on setting up the NAT thing in the server and installing
a proxy then disabling all
ports except the proxys (is this a good idea?)

I appricate any help
thanks

~Davie



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