windows 98 problem

hi,yesterday i install windows98 on my dell optiplex gx260 after succesful installation,i install all the necessary drivers such as audio,chipset,nic,graphic(downloaded from support.dell.com)but when i reboot my pc everything work fine except graphics,i goto device manager under dislpay adapter icon there was “intel82845G/GL” with a yellow mark on it.and was giving error code 12.further details of error code are “the device couldnot find enough free input or output resource,if you want to use this device you should have to disable the other device using the same resources.if any one solve my problem i’ll be thankful to him/her.fahad