how to create a shortcut from itunes to my desk top screen

Do you mean a shortcut on your desktop that you can double-click to start iTunes? If so:

• right-click on your desktop, select New > Shortcut
• in the dialog that Windows will then open, click on Browse ... and navigate to the location of your installed iTunes application - this will vary by both edition of Windows and the version of iTunes you have running, as follows:
  • 32-bit versions of Windows XP, Vista, 7 or 8 / all releases of iTunes - C:\Program Files\iTunes
  • 64-bit versions of Windows Vista, 7 or 8 / all releases of iTunes up to and including 12.0, or the "for older video cards" version of 12.1 - C:\Program Files (x86)\iTunes
  • 64-bit versions of Windows Vista, 7 or 8 / standard 64-bit version of iTunes 12.1 - C:\Program Files\iTunes
• select the iTunes.exe file in the folder you've just navigated to
• click OK, then Next, and then enter the name you want for the shortcut (it will default to "iTunes.exe") and click Finish.

If this isn't what you're looking for, please provide some additional details of what you're trying to do!