Hi,
Thank you for posting.
Regarding this error, please refer to the following document:
Event ID 1001 — Windows Installer Application Installation
If everything worked before, a quick solution is to restore the system back to the previous status when the issue didn’t occur with System Restore.
If the issue persists, please try the following:
1. Check Windows Installer service:
1) Click Start, type services.msc in the Search Bar and press ENTER.
2) In the Services (Local) list, right-click Windows Installer, and then click Properties.
3) Change the Startup type to Automatic.
4) If the Service status is “Stopped”, please try to start it.
2. Run the following command in an elevated command prompt to register Windows Installer:
msiexec /regserver
Thanks.
Nicholas Li - MSFT