When your computer boots, information about your computer is collected and stored in HKEY_LOCAL_MACHINE\HARDWARE hive of the registry.

Use Regedt32 to navigate to:

HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System

Value Name        Data Type        Sample                              SystemBiosDate    REG_SZ           04/29/00                                                             SystemBiosVersion REG_MULTI_SZ     PhoenixBIOS 4.0 Release 6.0                                                                                    VideoBiosDate     REG_SZ           99/11/30