My name is Sougata and I work for the Social Media and Community Team at Dell.I Would like to provide you information about the drivers for windows xp of your computer(Dell optiplex GX 280). Below are the chipset,audio and network drivers. Please find out what video card you have and install the appropriate video driver from the list of the following video drivers.
ATI video driverhttp://tinyurl.com/cc5k3km
Intel 915G Graphics Controller video driverhttp://tinyurl.com/cf8f2aw
Intel 82915G/GV/910GL Express video driverhttp://tinyurl.com/cxqeeo4
In case you need any more additional driver , it is available athttp://tinyurl.com/alldriversgx280