After establishing a bluetooth connection with another device from your computer the other device will propably stay in the Devices section of My Computer even after the connection is cancelled.
To remove that device follow these steps:
Open the control panel and head to View devices and printers under Hardware and Sound:
You will be presented with all the devices that are connected to your machine: printers, hard drives, input devices etc. Find the one that you want to remove, right-click it and remove it:
After installing Linux Mint 13 on your machine for the first time, you will only have few to no icons on the desktop by default. This makes accessing important files fast a chore. However, you can change this just like in the present versions of MS Windows.
To do so, go to Menu > Preferences > Cinnamon Settings > Desktop.
Here, tick all the boxes whose items you want to have on the desktop and close the preferences window again. If you want to remove them again, just repeat the process and untick the boxes again.