Using Easy Tether android apps you can easily use your mobile’s internet inside your PC or laptop. Other wise second option is that you can use wifi hotspot option of your android mobile to connect to your PC using wifi.
In case you want to use any desktop then use your usb cable to connect your desktop to use your android mobiles internet.
You can download “Easy tether” android apps from android market and follow the instruction as in application, download drivers and use your mobile as modem.
You may also like to see-