erm dont know if this is the right place...

but i might have a trojan on port 5000, is there a simple or quick way of closing the port without deleting the trojan or windows files?

thx

Get a decent firewall. Open up the advanced options, pick port 5000, and block it. The exact how depends on the specific firewall I guess.

where can i get a firewall? can i download one? what about a hardware firewall? anygood?

You can download free firewalls from:
http://www.cnet.com
http://www.tucows.com

You might also wish to check out a programme called Netbus Detective.