Connecting arduino to a PC
You have several options. One is Bluetooth and another is nRF24L01+ 2.4GHz Wireless Transceiver. I love the nRF24L01+. They are cheap and there are tons of examples online.

The concept with the nRF24L01+ is to connect the RF24 to a Ft232rl Ftdi Usb to Ttl Serial Adapter. The Ft232rl  connects to your PC. Most modern computer languages support communicating via Serial. This is the way to go.

Google around for a ton of tutorials