|"Windows cannot find any Bluetooth devices"|
That should need no further explanation, it's as clear as crystal.
Please read carefully if you didn't understand my first reply:
Your computer does not have a bluetooth adapter installed.
A bluetooth adapter is a hardware device, not software.
You need to buy a bluetooth adapter from a computer store or online from somewhere like Amazon.
A bluetooth adapter for a desktop PC can be either an internal add-on PCI card, or an external USB bluetooth adapter.
If, as I suspect, you don't know your way around the inside of a computer, you should buy an external USB bluetooth adapter, then you won't have to open the PC case.
You could save yourself a lot of hassle by connecting your phone to your PC with a USB cable like I do with my BlackBerry handset.
Then I just open the BlackBerry drive-letter in Windows & drag the files I want to my pictures or music folder.
Or, if your phone has a memory card for storing pictures & videos, remove the card, buy a card reader for your PC, then push the memory card into the reader. You don't need bluetooth for that.