hi I have a asus p4p800 motherboard intel pentium 4 c p u a nvidia geforce fx55o vidio card with 1 gb of ddr pc 320 memory . when I install the new memory I receve bad bios checksum error it then goes "cannot find floppy drive canot find c drive". if i start my computer press F1, computer goes into set up bios .I then exit bios computer running fine till I turn it off and reaboot. start the prosess again. with 1 gig of memory computer is fine but windows recognises the 2 gig when installed so why the error with two gig on start up. thank you Colin