A family member just received a new Compaq Presario desktop loaded with Windows Vista. The system was sold without a boot disc or OEM copy of Vista (instead, it has a backup of the factory installation of Vista on a second installed hard drive). The "fun" started when he learned that the anti-virus program he'd previously been using isn't currently supported by Vista. He actually threw a fit and refused to use another AV program. He was all set to just reformat the hard drive & put Win98SE on it until I pointed out there may be conflicts between 98 and the computer's hardware (I've heard that this is an issue). Added to the situation is that fact that he's managed to lose the serial number that came with his Win98 disc, so he wouldn't be able to proceed with the installation anyway. Is there a good possibility that Win98 wouldn't recognize some of the hardware? Also, how would the issue of the misplaced serial number be dealt with?