I hope you can see this!
The icons which Windows XP normally uses for disk drives etc are contained in a file called shell32.dll which is located in the C:\Windows\System32 folder. The normal icon for hard disk drives is number 8 in the file.
In this picture icon 0 (zero) is highlighted
Icon numbers:
0 4 8
1 5
2 6
3 7
You need to click the "create" button and then refresh My Computer by clicking the titlebar once and pressing the F5 key.
The result of choosing icon 8 for my C drive is as you see here