I had to install the BIOS update (BETA) for my M4 before Vista would allow the install/upgrade. The install went just fine for the BIOS update as well as Vista. Since the Toshiba has removed all of the BETA drivers etc... for Vista and posted them under each model's support section, I have noticed that there is no BIOS update posted with all of the other Vista updates for the M4. Does anyone know if Toshiba is planning to post a final BIOS update for the model, or was it maybe an over sight and left out of the list? I hate running a version of BIOS that is no longer available for download. It was required by Vista before it would even attempt to install.