Hi Mitch,
I'm Sumit, here to answer your query at the Microsoft Community.
for hex 0x1a91 / decimal 6801
ERROR_RM_NOT_ACTIVE winerror.h
Transaction support within the specified resource manager
is not started or was shut down due to an error.
1 matches found for "0x80071A91"
Which antivirus are you using?
Also, Press Windows+R keys on the keyboard, or Right-click Start on the Taskbar and choose Run.
Type services.msc
Press Enter.
Can you ensure Windows update and BITS service are running, and not stuck?
Hope that helps, and rely on us for any further inquiries. All the best.