Disabling one computers internet on a wifi network

[brianwaterjet]

Hello,
I have several computers on a business wireless network. I'd like to disable ones access to the web while still allowing it to use the network for transferring files and so forth. What's the best method for this?

 

[Emerald]

what router do you use?

 

[brianwaterjet]

It's a Frontier Wireless router; Actiontec MI424-WR rev.F