System interups & Service Host:Sysmain using 100% of CPU and PC shuts down t times.

[MamaAnne63]

My computer always seems to be utilizing 100% of the CPU for extended periods of time. When I open task manager the 2 main culprits are  System interups & Service Host:Sysmain. I have run all HP diagnostics as I believed from reading it might be a hardware problem. All tests have passed. I thought as my All-in-one came with only 8Gb or RAM it might be struggling so installed an extra 8Gb but his has not helped the problem. Internet pages are slow to load and on occasions the computer will do a soft restart and I have to log back in. I have gone into my startup and have disabled all nonessential programs from starting and have run a full malware and anti-virus scan. If I was to describe the noise my computer makes I would say it sounds like a large fan running. 

[KrazyToad]

@MamaAnne63

Welcome to HP Community

I have gone through your Post and would like to help

I appreciate all your efforts in troubleshooting this issue

At this point I suggest you perform a Reset. Link: https://support.hp.com/in-en/document/c04742289

Keep me posted

If the information I've provided was helpful, give us some reinforcement by clicking the "Solution Accepted" on this Post and it will also help other community members with similar issue.
 

[MamaAnne63]

OK will do. Ill keep you posted. Thanks for the help

[KrazyToad]

👍