Hi! Welcome to the Samsung Members community!
Download a Windows media file from another computer and do a Windows repair. I'd suggest watching a video for this.
Any software the Galaxy Book needs can be redownloaded on the Samsung website.
However, reinstalling Windows is a last resort. What troubleshooting have you attempted?
Have you tried loading into the Windows recovery screen and doing a restore point?
Cmd prompt for sfc/scannow, etc.?
To get into recovery screen
Hold down the power button for 10 seconds to power off your device.Press the power button to turn on your device. As soon as you see the initial indication of Windows starting (such as the manufacturer's logo appearing during a restart), hold down the power button for 10 seconds to power off your device.Repeat this process twice.On the third start, Windows will boot into the Recovery Environment