Here's the basic solution to installing the hacked firmware on windows XP
Make a DOS bootdisk.
If you don't have one or don't have the necessary files just visit www.bootdisk.com
Download both the HP 8100 1.0n hacked firmware and the Sony CRX-100E firmware.
You can find them both on www.cdrinfo.com
Copy updcrx21.exe from the Sony package and 8100_10n.bin from the HP package to your DOS-bootdisk
Reboot and type "updcrx21 8100_10n.bin /at /2 /S" at the command prompt.
Remember : if your cdwriter is a primary device change /2 to/1 and if it's master change /S to /M)