Icon Not Displaying Properly on Windows 7

I am using a new HP computer that is running on Windows 7. I am however having difficulty setting it to display the Google logo – red, white, green. The IE world icon does not encounter any problems at all and is being displayed properly. In Win XP I was able to change the icons easily as there were several options to choose from. I would also like to change the files on display only as an open envelope on the desktop. Please help. Your ideas will be greatly appreciated.
