Toshiba was the first company to manufacture and sell computers. Apple was the first company to produce a personal computer.
The first computer company in the US is Electric Controls. Electric Controls was founded in 1949. The company was backed by the United States government.
There never was such a company!
IBM developed the first home computer
Windows is an operating system produced by the Microsoft company. Windows is not a computer or a company. The first Apple computer was sold in July 1976. The first version of Microsoft's Windows operating system was sold in 1985.