Many times when you download images from internet or transfer from other device like computer, pen drive, USB stick memory, mobile card, digital camera. Some time it’s not correctly transfer in your computer, and when you trying to open this file in Photoshop its show some error “this image is corrupt”
But you open same image file in computer without any problem. So follow these steps –

Follow these steps
1.Open Adobe Photoshop cs3
2.Open your wallpaper (file menu>open>select your wallpaper or drag your wallpaper in Photoshop window)
3.Press Alt +Ctrl +i and set your wallpapers resolution size.
4.If you found constrain proportions option is select, first unselect it and give your wallpapers width and height size.