Can you not use your old computer any more? What you could do is..
Get the old hard drive, and put the jumper, in the master position. Then, make it the primary hard drive, according to the IDE cable - (although you should be using SATA if it's a gaming machine
Do that, and then you will have to repair XP, because the old hard drive, will not reconise the new chipset.
So, repair XP, then move everything to a folder, in the opening of the C:// Drive, so you can easily get it.
Then, put the jumper, on the slave pins, and put the jumper on the new drive, onto the master pins. Hook the cable up accordingly, and off you go!