Sorry, had a power failure yesterday
The upload shows lot's of cryptographic errors - but since you're clean let's put them on hold for now.
I did notice some unexplained shutdowns on 29 and 30 Jan
Did you shut the system down by holding the power button and numerous occasions on those days?
If not, then please start with these free hardware diagnostics: Link Removed
Please post the results when done.
If you did press and hold the power button to shut the system down, then please run SFC.EXE /SCANNOW from an elevated (Run as administrator) Command Prompt.