Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.
One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.
Windows Server 2003 Enterprise server can use the /PAE switch in boot.ini to use a software based 36bit addressing mode so it can ustilise more RAM - but this option is not available with XP.
So to answer the question directly - it is likely that you are utilising less than 25% of the last Gb of RAM - if you remove it then there will be a slight loss of avaibale ram - but not much.