不曉得您有沒有看過官方網站上的相關說明呢?
引用關於 WinXP 的部份如下:
Windows 2000/XP: DVD Region Killer 2 will not work on Windows 2000/XP with DVD Player software which uses an ASPI Layer. If your player software does use an ASPI Layer, you should update it, e.g. the newest versions of Cinemaster, ELSA, ATI or PowerDVD do not use ASPI under Windows 2000/XP.

另外版本演進內也有說明支援的 OS:
Version 2.3.0.1, December 8, 2001
Improved ElbyCheck: The scan for corrupt filter drivers will only be started, if no CD-ROMs are present. (Windows 2000/XP)
Improved Install / Deinstall of Filter driver, fixing various compatibility problems. (Windows 2000/XP)

Version 2.2.0.1, December 3, 2001
Improved region code automatic on Windows 2000/XP
Improved DVD-ROM detection on Windows 2000/XP
Improved Filter installation/deletion on Windows 2000/XP
Changing Autostart didn't work, if you weren't Administrator on Windows 2000/XP
Added "ElbyCheck" program, which will monitor the installed filters of CD-ROMs/DVD-ROMs
Some Games like FIFA2002 didn't work, if Region Killer 2.1.0.1 was installed on Windows 95/98/ME


給您參考一下~