^huh what is fleckyboy talking about!!
yes it could be not enough space on your hard drive, but you would have windows warning you you were running out of space, so you'd know!
Very unlikely to be a firewall stopping a game from running!
Fat32 is not a file.. it's the file system that your drive could be formatted in!!
check you have the latest drivers for your graphics card installed, you should be able to get those from the computer manufactures web site
and check you have the latest version of dirext x installed from here
http://www.microsoft.com/downloads/details.asp x?********=2da43d38-db71-4c1b-bc6a-9b6652cd92a 3&displaylang=en
try again and if it still doesn't work post back with more details, like what version of windows and what game