There is a world of differencebetween '64-bit ready' and '64-bit installed'
'64-bit ready' usually means that there's a 32-nit OS installed on hardware that is capable of running a 64-bit OS.
This is often because of being supplied with a low RAM count - which makes 64-bit less efficient.
You should be installing 32-bit updates (which will be delivered automatically by Windows Updates).
You are getting thigs confused, I suspect.
Please tell us EXACTLY what you did - the only 'Download' folder (not driectory) in Windows is irrelevant to what you seem to have done.
Terminology and names are important - or you could end up trashing your system beyond an easy fix, and there's not a lot we can do about it.
Please only follow direct advice - if you do follow another forum/person's advice, make notes along the way and let us know exactly what you've done.
Your 800F0902 error seems to be very much an unknown - I would start with using the Fixit from this page...
How do I reset Windows Update components?