Note
If you can't edit a photo in Windows Live Photo Gallery, one of the following reasons might be the cause:
The photo properties attribute is set to Read-only. To change a photo’s read-only property, right-click the photo and select Properties. Under the General tab, in the Attributes group, uncheck Read-only, and then Apply.
The photo is stored in a read-only location like shared network file, a CD or DVD, or other location where you can’t change its properties. To save a copy of a photo to your computer where you can edit it, double-click the photo, click Edit, click Make a copy, select a file type, choose a location on your computer to save the photo, and then click Save.
The photo is an unsupported file type. Photo Gallery can't open or edit all photo file types. To save a copy of photo and change it's file type to a format that you can edit, double-click the photo, click Make a copy, select a file type, and then click Save.
The photo might have been deleted or moved after you selected it for editing. Restore the photo to its original location, and then try to edit the photo again.