You need to purchase a combined wireless modem/router. If your PC is not wifi enabled you can hard wire it to the modem/router if it is close to the 'phone socket. If not you will need to buy either a wireless USB adapter or a wireless card to go in your PC. Your laptop will probably have wifi capability if it is new, otherwise you will need an adapter for that too.
Pipex will supply all the information you need to set up the broadband connection to the modem/router. To connect wirelessly to your PCs, use the set up wizard that comes with Microsoft XP operating system. Likewise there is another wizard that enables you to set up a home network that allows you to share both files and printers between PCs in the network. The wizards can be found in the control panel.
Setting up a secure network is included in the wizard settings.