In Windows Explorer you first point to c:, then up in the search box type or paste this string:
kind
ictures
... this will find all your pictures anywhere on the drive but it takes a long time if you have a 1TB drive like I do. (This also works for
kind:video and
kind:music, in fact if you just type
kind: it will give you a drop-down menu to pick your search type)
Alternatively, if you only want a few different file extensions then you can use:
jpg OR png OR gif
... to find JPGs & PNGs & GIFs all in a single search (note the OR must be in capital letters)
Windows uses libraries and, although the practice started in XP, you weren't forced to use that structure but in W7, and with hard drives getting so huge, it is a very good idea to sort your information into the appropriate libraries (Pictures, Music, Videos, Documents) then all your pictures will be in the Pictures Library and you don't have to search all of C:, you can instead point to just the desired library to start your search.