1.First of all the picture you want to use should have .ico extension(if you already have a pic with .ico extension proceed to step 2).Most of the pictures we normally use have extensions like .jpg,.bmp,.png..gif etc, so you first need to convert them to one with .ico extension.This is simple.Just go here and put your original image in the 'Source Image 'section,then click on 'Generate Favicon.ico ' button to get your image with .ico extension.

2.Now go to My Computer.Suppose you want to put this icon in place of your original C: image.

Double click and enter C: .Paste your .ico image file in it.Also create a new text file and in it type the following lines:

Remember that 'favicon.ico' in the second line is the name of your image file.If you have an image file with .ico extension by the name of 'abc.ico',then use that in the second line in place of 'favicon.ico'.

3.Now rename this text file as ' autorun.inf ' (without the quotes).

Important Note:How do I rename my text file as autorun.inf ?Ans.Go to Tools->Folder options.Under the View tab uncheck the 'Hide extensions for known file types'.Press apply.Now rename your text file as 'autorun.inf'.

4.Now restart your Pc.You are done.Check out the cool new picture you have just added in your My computer panel.