Not booting after BIOS upgrade in T500

I upgraded my T500 from BIOS 3.09 to 3.18 using the windows upgrade utility (6fuj42us.exe?). The upgrade went fine. I rebooted the machine and got the login windows screen (I have windows XP professional). However, the instructions of the BIOS upgrade called to enter into the BIOS and press the F9 key in order to set all the system defaults. After that the machine did not boot. It gives me the initial windows booting screen (windows flags) and then a blue screeen. I downgraded the BIOS to 3.15 using the bootable CD utility (6fuj39uc.iso?). The downgrade went fine. I can get into the BIOS but have exactly the same problem when loading windows. Unfortunately I could not find a similar bootable program for BIOS 3.09 only the windows executable program (6fuj34us.exe?). Is there any fix other than reinstalling windows? Thanks.

Hi malope,
please enter the Bios and check the HDD is switched to compatible mode instead of AHCI Mode.
Maybe than you can start Windows.
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