Not only is this false it was demonstrated as false in court.

“Microsoft later submitted a second inaccurate videotape into evidence. The issue was how easy or difficult it was for America Online users to download and install Netscape Navigator onto a Windows PC. Microsoft's videotape showed the process as being quick and easy, resulting in the Netscape icon appearing on the user's desktop. The government produced its own videotape of the same process, revealing that Microsoft's videotape had conveniently removed a long and complex part of the procedure and that the Netscape icon was not placed on the desktop, requiring a user to search for it. Brad Chase, a Microsoft vice president, verified the government's tape and conceded that Microsoft's own tape was falsified.” https://en.wikipedia.org/wiki/United_States_v._Microsoft_Cor....

Also I had forgotten about this bit: “Later, Allchin re-ran the demonstration and provided a new videotape, but in so doing Microsoft dropped the claim that Windows is slowed down when IE is removed.”