vettedrivr made some errors, there.
You need RSLogix 5000 programming software. Probably your system was written in relay ladder logic only (ask the original programmer if he used Function Block Diagram or Structured Text languages), so you only need the Standard package.
You don't need a licensed version of RSLinx. RSLinx Classic "Lite" will provide the services that RSLogix 5000 needs to connect to the controller.
You need RSView Studio for Machine Edition to edit a "PanelView 700".
The terminal is more accurately called a "PanelView Plus 700", to distinguish it's product line from the Standard PanelView terminals (there's no "700" Standard).
Since you did not mention any ControlNet or DeviceNet networks, you won't need those configuration packages.