Where are these images located? Which folder(s)?
Usually images you download yourself can be deleted as you wish, but many programs/applications use image files and deleting those could cause problems.
I've just done another search in Windows Explorer, and for some time now have noticed a tonne of images on my system which I never use or am likely to use. Is it safe to delete all these images???
I don't know where most of them came from or how they got there. My guess is that some how they just accumulated over time while browsing, so you cam imagine how many there are. My OS is Windows XP Home Edition.