I have a non bluetooth PC . I want to make it bluetooth PC with the help of usb port. How can I make it?

There are some min USB/Bluetooth adapters. They only stick out a small amount like < 1/4" for about $20. CompUSA has them.

It's pretty simple, you just need to buy a bluetooth dongle, it just looks like a standard usb key but it's actually bluetooth, then using the program windows (If you use Microsoft that is) has, you'll be able to search for your bluetooth device and send/recieve files via bluetooth, I do it all the time ^^