He only did the cleaning. He had to get back into it to find out why it wouldn't start. He never even checked that.
Look in the quote area for my comments. I don't know how to break up the quote.
If there was a problem with the HDD then I would expect the problems to more than intermittent, but can you open a Command Prompt (Admin) and enter chkdsk /r
Type and enter y for it to execute on the next reboot then enter shutdown /r /t 00 and wait for it to do its thing which will take a while to run.
When it has rebooted after completion, open Event Viewer and ensure Event Viewer (Local) is highlighted in the left pane - if it isn't then just click on it.
When it has read the data, expand Windows Logs - click on Application/Action/Find and type chkdsk or wininit into the find box and press enter.
Cancel the Find box and read the report in the scrollable window.
Other than whatever else it reports, check to see if it reports any KBs in bad sectors.
Nothing was found when the chkdsk command was ran.
Memory can also be another cause of freezing.
Go Start - type memory and press enter when Windows Memory Diagnostic comes up then click on the Restart now box.
You will be able to follow its progress as it scans and if it finds any problems.
Memory was OK also.
Drivers can be another problem and updating those can help if they are the cause.
There were probably 7 drivers that needed updated.
I would expect something to be in Event Viewer if any of those were causing services to terminate.
In Event Viewer click on Errors then on Show All Instances of This Event in the lower right pane.
You'll be looking for errors with the date and time stamp for when the freezes occurred.
However, I would have thought that your son-in-law would have already done these checks.
I tried to look into the event viewer and it froze on me.
I have no idea what to look at now, except for maybe reloading the entire windows installation.
Thanks for all your ideas. This is a legal installation of Windows 10. It was an online update when it had Windows 7 on it. She upgraded it for free before the offer ran out. I have to find the write up I have to do a reload without having a new serial number.
Thanks again,