The typical graphic batch utility such as Davids Batch Processor for Gimp, Phatch etc will crop an image but not in the way you want.
IMHO, you will have to resort to command line and Imagemagick. You can get Imagemagick fromhttp://www.imagemagick.org
One thing to note, as with any batch operation, you can do serious damage to your images, so always work on a copy until certain that the effect is the one you want.
the imagemagick command is easy. bearing in mind the above
the safe one
convert *.jpg -crop +100+100 +repage new.jpg
will remove 100 pix from top and left of *all* jpgs in a folder. New files will be created new_00.jpg, new_01.jpg etc corresponding to the order of the existing.
more risky but possibly more useful
mogrify *.jpg -crop +100+100 +repage *.jpg
will trim and *overwrite* all the existing jpg files in the folder, so you keep the same filenames.
So, procedure would be.
Make a new folder, copy the files you want into that folder. Open a command window. Move (cd - change dir) to the new folder. Run the command. If you have different image formats, change the command (maybe jpg to png ) and run for each format.
Quick test, 40 jpgs, different sizes, 1 min 20 secs.
more info inhttp://www.imagemagick.org/Usage/crop/