Windows 2000 Pro Err

My Windows send Error
KERNEL_STACK_INPAGE_ERROR
Then i reboot computer and go to Windows 2000 Recovery Console and run run CHKDSK /F /R and then Exit but same Error is display…
Then i boot computer from windows2000 CD then
this error is display
********************************************
Windows NT has not found enough extended memory 7MB of extended memory is required to run windows NT .Your may used to upgrade your computer or run a configuration programprovide by manufactures.

Memory map:
00000000-00098000
*******************************************
BUT:
My computer has 256MB of Ram,AMD K6-2
Pls Help me….