I'm sure there is probably a link to this somewhere in here already but i have tried for the last half hour to find something and no luck thus far.

I have sooooo many photos on my computer that i have had to take off and put on disc to free up room. All my images at the moment are still as 'image777.jpg' so makes it really hard to find what i am after. I know i can just rename it but i seriously cant rename 1000 photo's 'Jackson' is there a program i can use that will let me 'tag' them without actually changing the name of the file? I dont know, i am completely lost with it