192.168.1.254 is the routers IP address.
This is the GUI interface of which you can configure the routers settings via a webpage.
Now... What you need to do on every PC is configure each of the PCs an IP address for best performance.
PC A/Server will be: 192.168.0.1
PC B will be: 192.168.0.2
PC C will be: 192.168.0.3
and so on...
and subnet mask for all is: 255.255.255.0
These IPs can be configured by:
Control Panel > Network Connections/Network >
Select the adapter, normally LAN 10/100 ethernet...
Then properties > Specify IP address.
Now... To set up the Router put in Gateway the following IP: 192.168.1.254 and subnet mask as above.
This should now work...