Bad results from a bios Update - help please

[HP_help_please]

Hi, I need some help regarding my HP Pavilion Media Center a1640n Desktop PC - running Windows Media Center Edition 2005. I have updated my BIOS - P5BW-LA/P5BW-LE Motherboard BIOS Update from the HP web site using - File name: sp35153.exe.

Motherboard is ASUS P5BW-LA.

After I ran the program, it asked me to restart. After restarting, Windows does not start. I have tried to enter safe mode and last good known settings and normal settings - but every time it shows the Windows screen and 3 seconds later - it goes back to the screen to select which mode to start. Could it be the updated BIOS which ran some kind of program which Flashed something - resulted to this? please help
thanks

[edwin]

No more likely you need to repair your windows installation as it cannot find the harddisk controller anymore. This kind of stuff can happen after a major bios upgrade sometimes.

[Denniss]

Assuming your HDD is SATA, check your Bios for a SATA controller operating mode. If it's currently set to native IDE/compatible try AHCI instead or vice versa.