Mouse in Windows 1.x
Microsoft Windows 1.x doesn't have support for PS/2 Mouses, Windows 2.x does, it is easy to add mouse support to Windows 1.x using Windows 2.x first disk.
Step 1: Extract mouse.drv from Microsoft Windows 2.03.
Step 2: Put the mouse.drv into the first disk of Microsoft Windows 1.x and replace the current file.
Step 3: Now install Microsoft Windows 1.x as normal but select Microsoft BUS/SERIAL mouse in the setup.
Step 4: Now you should have mouse support in Windows 1.x, it is not click and release, but mostly click and hold.