could be part of it. Games are probably the most complex
programs commonly in use, using the different graphics
cards, sound cards, and joystick, networking, the list
goes on and on. Anything could be the problem, depending
on how limited that account is. They could even be broken
simply because the installation made registry keys only
for the account that installed it. Older games also can
do things that the OS will ban (talking directly to
hardware is not allowed now). I advise you to make your
limited accounts with the opposite goals if its a home
computer. Think of what you want to block and remove it
instead of trying to think of everything to allow and
adding it back.