QUOTE(Zentraleinheite @ Dec 11 2006, 01:18 PM)

The server that is connected directly into the router--it's main role is just a file server. Instead of carrying around a jump drive, I just set up a server. :-P (It is running WIN Server Ed., and I don't beleive it uses much bandwidth, if any at all while I'm at home.)
Yes, connected throught the #3 port on my router (#1 is the main computer, #2 is the server) is the switch, approximately 55ft away. The switch is a 10/100 switch, and yes...a desktop/gaming computer is connected, along with a Xbox Connect server. (I just use this server to manage my Xbox through.) The server also is a file server like the other one. I keep the Xbox Connect client closed when not in use, so once again, neither of the servers are using much, if any, bandwidth.
None of the servers are running DNS, WINS, etc.
Yes, the router is configured to DHCP.
My modem is not configured for bridging, but I don't think it supports that function as I did not see a setting.
Ok this is a pretty basic setup here below.
1. Set ISP Modem to bridge mode (this allows all data to pass to thru it to your router)
2. Set your Router to connect to your ISP (usually set to obtain auto or it uses a PPoE connection)
*Since you said you didn't see any bridge mode...it maybe already set for it..so you can probably skip step 1 and 2
3. Connect only the Switch to the Router
4. Plug all Computers and the server to the switch
5. Plug Xbox to Switch if possible..but if it requires too many ports then just keep it connected to the router
6. Give the Server a Static IP
7. Forward any and all ports to individual computers and server
*this is optional (If you don't know how to do this....just ignore this next step!!)
8. Disable NAT from the Router and setup DHCP on the server
You may or may not know most of this or any....but just in case I'm typing it out! =)
Router
Routers tend to be decent if not very good basic firewall and protection for your network. A Hub or switch does not do this..its just a junction box connecting a bunch of computers together.
Keeping all your systems behind the router is better security for you.
Now that you got your router setup...login and forward any and all ports to your workstations (games) and server (FTP if you use it or whatever)
10/100 Switch
Ok reason I say use the switch to connect everything is cause one it gives you one device to manage all them together and second not all Routers support 100MB connections. So having devices on it and other on the 100 are doing you no good internally. They all drop to 10MB cause thats what the router supports. So putting them all on the Switch they all connect to each other at 100MB.
Static IP
Ok on servers you always want static IPs cause we tend to access our server alot. If you have it on DHCP there are chances it will change IP's on you. Then you would have to log into the router every time it changes and update it. So always use static!
Another reason is say your running a FTP Server (being a file server) and you need access...well if IP changes you won't be able to access it till you update the router to point to it again!
as for the slowness of the one computer..check for spyware, virus, and clean out Temp Internet files and so on. Try logging onto that computer as a different user..make up one and let it create a new profile and see if that speeds things up after you do the checks.
hope those help
Urlryn