I purchased an off-lease HP Vectra model D7968T. Going to the HP site for upgrade information I find hard drives and memory costing hundreds of dollars for small GB’s. I successfully added a 3 GB hard drive but I need more. What can I put into this system? Does hardware have to be from HP? Will other hard drives work? (HP specifies an Ultra ATA 66 IDC hard drive). This computer has Linux. I don’t even know what that is or what it will do. I managed to add Windows XP home. It loaded into another partition, the basic partition holding what I believe is the HP computer’s basic information. As a computer dummy I am stumped and don’t want to purchase hardware that will not work with this computer. I need simple answers as I am no pro, just a tinkerer.