|There's lots of things being said here. |
Bottom line is it appears your DVD disc is a DVD-RW and you're trying to run it in a DVD ROM drive.
Well you can't.
You can buy a new DVD-RW drive, (I think blu-ray drives are backward compatible with dvds but check on that). They're usually easy to install especially nowadays as newer versions will most likely have Sata connections. But you still won't get the DVD disc itself to boot if it is not bootable.
Incidentally, original XP discs were only available on CD's not DVD's.
The solution is to borrow a bootable XP cd and copy it, (THINK, definitely not sure, if that is legal but there you go), or buy one. Again not sure if you can do that as apparently they stopped issuing them with PC's because of piracy.
To sum up, your only options are to buy a new drive and copy or buy a bootable XP disc.