I too am unable to install KB2871997 on just one computer. Have tried all the fixes: scan, Mr. Fix It, Clean Boot, etc. Error 80071A2D
Would like to mention, it seems to install just fine, asks for reboot, the on reboot there is a period shortly after startup where a series of number flow across the screen - something like updating 1 of 3,781, right after that point, it states the update failed.