try booting from the cd then go into recovery console and after you select your hard drive with windows XP on it, then enter you admin code usually you should press enter and it will go unless you actually set a system admin code. then type chkdsk. then reboot and try that. if not reinstall.
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i5 2500K 3.3zGHz CPU
z68 Chipset Motherboard
8GB DDR3 1600 RAM
GTX 560 Ti GPU
700W PSU
1TB HD