Phaedrus is right in his suggestion to use a desktop search utility like Google Desktop. This will search any file you need in just a few seconds. But it will not "Organize" your data as you asked.
You have to organize your data yourself. One way to keep things organized in your PC is to make separate partitions/folders for separate things. Like keep all the office work related documents at one partition, windows and softwares to be installed in one partition, movies, music and fun files in one and just like that. If you dont have so much partitions, you can use separate folders.
This will keep all your data organized in your PC.. I hope so
