my family PC has been trying to install a security update for a week, it downloads, asks to restart, gets to 100% and then says its undoing changes... back in Windows, i get this:

Windows Update
We couldn't complete the updates.
Undoing changes. Don't turn off your computer.
Error code: 0x800f0922
error 0x800f0922. I've rebooted more times than I can count. I'm worried that if I keep ignoring it I'll miss important security fixes. is there something broken on my drive?? I've also checked that there's plenty of free space, and the internet connection is stable the whole time. it feels like teh family PC is fine until the very last step, then it simply gives up.
