The trick with reg.exe didn't work for me. The file got updated but I got a blue screen during Windows setup: 0x00000067 (0x00000004,0x00000008,0x00000000,0x00000000) CONFIG_INITIALIZATION_FAILED This is the code I used: COPY SOURCE\I386\SETUPREG.HIV SOURCESS\I386 HFTOOLS\REG load HKLM\HFSLIP %PREP%SOURCESS\I386\SETUPREG.HIV HFTOOLS\REG add HKLM\HFSLIP\CurrentControlSet\Services\atapi\Parameters /v EnableBigLba /t reg_dword /d 00000001 HFTOOLS\REG unload HKLM\HFSLIP DEL/Q/F SOURCESS\I386\*.LOG Maybe it is necessary to do this in ControlSet001. Would be the first time, though...