Windows 10 update error 0x800703f9 could occur during an upgrade from an older version to the latest. It could also occur during software update installation. Sometimes, it is the lack space that causes the problem. If you have lots of space on your C drive, then the problem is elsewhere.
Many Windows users complain that the 0x800703f9 error stops them from updating their system. This error is often encountered by users when trying to upgrade to Windows 10 or when they attempt to update their Windows 10 OS.
