Sorry, I may have misunderstood.
The intructions I posted earlier were for using an IPhone photo for your IPHONE wallpaper!
If you want to use the photo on your PC's desktop:
For Windows 7 PC
- Send it to yourself in an email.
- Save the email attached photo on your hard drive.
- If desired, you can resize it in any photo manipulation program
- Go to Control Panel > Personalization
- At bottom, click on Desktop Background Icon,
- Browse to desired photo, Select it & Save Changes.
Try this and it should work!