If any of the installations request it, use the serial 0000QRCD0000 and that shall work with it, thanks to The Flying Scotsman on YouTube for mentioning it in one of his Armada E500 videos. Compaq Armada E500 & V300 QuickRestore Windows 95, Windows 98 First Edition, Windows 98 Second Edition, Windows NT 4.0 Workstation & Windows 2000 Professional ISO Images, the 98 First & Second Edition images will also work on the Armada V300, the 95 one does not, if you are able to have access to an E500, put the hard drive into an Armada E500, use the 95 QuickRestore image on that & once it's all set up, put the hard drive into the V300 & it will work fine.