Geek Squad said I might have a "hidden" virus

My HP laptop if often excruciatingly slow so I've taken every step that I know to do.  I've done a clean install, turned off almost all startup apps, scanned with Malwarebytes (14 days straight) and Windows Defender Antivirus - nothing, ran Windows performance check, checked defrag (0%), using high performance power plan, Windows 10 is up-to-date.  Yesterday, it took almost 20 minutes from cold bootup to be able to do anything.  I often get Not Responding message when opening a Word or Excel file or a website.  Today I took the attached document showing specs and settings to Geek Squad and the only thing the tech could come up with was that I must have a "hidden' virus....which he could check out for $150.  What am I missing?  Does this sound like I should go through your malware removal process?

Thanks.

Larry Grubbs
HP Pavilion 15-cc5xx
i-7-7500U CPU @ 2.70 GHz
16 GB RAM
Windows 10 Home