i have a optiplex GX270 computer with Microsoft XP operating system. i went to dell.com and put in the model of the computer and got the driver for the Ethernet. i have delldriverdownloadmanager wish is recomended for this computer. i right click on the my computer and go to the update device i try the location i have the device driver but it wont let me press ok. when i find the driver to install the ok disappears and just the cancel button stay on. how do i run the driver? please help