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Hard drive slowed to 1/10000 speed after logging into windows 10 pro

arthurh88 asked
Last Modified: 2019-12-04
Suddenly, my PC is unusable.  It boots quick, right to the startup screen, then once I log on, it goes south.   The hard drive will literally stop...completely...and then every 3.5 seconds, it will "Ka-chunk"....as if it just read a few bytes.  

this is what the hard drive sounds like after logging on to windows:
ka-chunk  (one....two....three....)
ka-chunk (one...two...three)

It takes literally 8 seconds for me once I type a single character into the search bar for the character to appear.  This is how slow the computer is.  After about 12 minutes, the icons finally fill my desktop.

safe mode with networking repeats the problem.  but safe mode without networking works great.  but i have no idea how to troubleshoot this :(

Scandisk was fine.  Hard drive works great (boots to windows fast).

Anyone have an idea what might cause this?
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