See google for BELARC ADVISOR and EVEREST.
The machine does not have to have internet to use these since we put them on CD or USB memory stick to run on the machine.
I have a custom-built PC with no manual. I need to find the motherboard manufacturer so I csan download and install drivers. All I have is the serial # off the board:333542-0010330704ww. I've been to several websites and can't get help. They all want the "BIOS #, which I don't have and cannot easily get because my home internet is down and I am using the computer at the library. I'm about to tear my hair out. Someone help me please.