Windows 95/4.00.73g

From BetaArchive Wiki

Windows Chicago build 73 is widely known for its start menu button which was just the Windows Logo and has no "START" text. This has widely been speculated to the creation of the Vista Orb buttons (which also feature the logo) in Windows Vista and Windows 7. There is an edited version by KenOath called Windows Chicago build 73 (no g) that features the floppy boot up disk on the CD.