I found these two entries while using Windows Explorer in Local Disk C:
What do they mean? Can I safely delete them or transfer them to My
What they are is easy.
Whether or not you can, or should, delete them depends on where they
Become a Patron of Ask Leo! and go ad-free!
These folders are most often created by various update utilities – most
often Windows update – as temporary locations to store files before or while
the update is applies to your machine. They’re supposed to be deleted
automatically when the update is finished. But as you’ve experienced, that’s
not always the case.
Same for me, by the way. I just found a folder
“C:\66b56c24fd10a4d55d658cce1cc19e” on my machine.
If you have more than one drive, you may find them on drives other than C:
as well. I’ve found them on my external hard drive, E:, on occasion as
– you can always copy the folder to some other location…”
The short answer is that if these folders exist at the root of one of your
drives, you’re quite safe to delete them, particularly if they’ve been around
for a while. They’re just unnecessary leftovers from a previous software
If you’re paranoid – and it’s often good to be paranoid – you can always
copy the folder to some other location or burn it to a CD. That way in case we
were wrong, in case something appears to start misbehaving after removing the
folder, you can always restore it from the backup.
Me? I just deleted “C:\66b56c24fd10a4d55d658cce1cc19e” from my machine.
One caveat: if you find these folders anywhere underneath your Windows
directory, I’d be tempted to leave them alone. I’ve seen comments that it’s
possible that they might hold the updated files for a possible uninstall, or
for Windows System File Protection. As long as they’re not taking up much
space, then they’re fairly benign anyway.
However if you can’t resist and want to delete them anyway, then I
definitely recommend copying them somewhere for safety first, just in case.