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I understand you are having an issue with HP Support Assistant and PC Settings not working on your HP Pavilion All-in-one PC. Don't worry as I have a few steps to help you get through this concern,
To provide you with an accurate solution, I'll need a few more details:
What happens when you try to open HPSA? Do you get any error message?
Have you tried disabling your Antivirus program to do the updates?
Have you tried doing the updates using Windows Update?
Have you tried to update the HP Support Assistant?
Have you tried to do a clean boot and then tried the updates again?
If you are having problems updating HPSA itself, download and install the latest version of HPSA from the HP Support Assistant Web site.
If the issue persists, I would suggest you try to perform a system restore to a previous date where it was working fine (within a month), using this link.
If nothing works, I would suggest you try to perform a system recovery using the partition available on your PC.
Doing this will wipe off everything and set the computer back to the original factory conditions. So, please remember to back up your data before initiating system recovery. If for some reason the recovery fails. The only other way to install Windows would be to order the recovery media for your laptop and using the recovery media you can install Windows. You can check if the recovery media is available online on www.hp.com/drivers by entering the exact model no. of your laptop. To find the exact model no. click here: http://hp.care/2bygf7l
Otherwise, you could also reach HP phone support to order the recovery media. If your product is out of warranty, please choose paid options to get the tech support number.
Please use the following link to create yourself a case number, then call and it may help speed up the call process: