If it is a relatively new Laptop, it should have a built in Wireless Adapter. If it is a Desktop PC, it won't. But in case someone has installed a wireless card. Check at the back of the PC casing, where everything is plugged in, if it has an internal wireless card there will be an arial.
as for the Games & Calculator left click 'Start' (bottom left) left click 'All Programmes' Look for 'Games' & 'Accessories' when you hover the mouse over them menus will open revealing the contents. Accessories contains the 'Calculator'.