I think Windows is successful because it was defacto preinstalled on all computers. Even people in third world countries are buying computers whole, not a basket of parts to assemble.
Also software. You’re not going to assemble a computer, install Linux, and then not be able to run anything on it. You want to run all the software that was built to run on Windows, which was built to run on Windows because it came installed on every computer, etc. (Remember Linux back then really couldn’t run all that much. No office? No games? You’re toast.)
If that’s the case I would say none then. The constitute parts aren’t the item. (How many ships are produced by a forest? None, we use the wood to make the ships.)