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You need a controller having usb module.
Several controller are there in market.
Try using PIC18F4550 it having usb in built and microchip has also provided the free usb stack for its implementation.
Might I suggest that you use a USB to TTL serial adapter available from eBay for only a few pounds/dollars, these work well provided you do not want very high speed. If you get one of these type modules I recommend that you get a FT232RL type as they have Windows 8 drivers as well as handshaking.
yes pjmelect is right if u using FT232RL then it is the best converter of USB TO UART.
in this configuration u have to code your microcontroller side UART configure and this chip working . please read datasheet to understand how to connect with microcontroller to PC.
BUT IF U WANT TO CONNECT USING USB THEN PIC HAS A PROVIDED MICROCHIP APPLICATION LIBRARY TO USING CDC CLASS .
In any case you need an application on pc side.
My suggestion is that either use usb-hid class or usb-cdc class
First make your usb device using pic and test it with pc.
For usb hid class you can use hid terminal from mikroelektronika and for usb cdc class you can use hyperterminal.
After testing your device move further.
If you use usb hid class then there is a usb hid tempelate in visual basic from which you can develop your own gui.
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