Windows 10 Start Button - HP Compaq 6200 Pro Microtower

I have the above mentioned PC that has windows 10 pro installed. The issue:
Upon boot the PC stays on black screen for 5 minutes the shows login screen. After logging in the PC takes another 5 minutes on black screen before Windows 10 appears. After that the PC is wonderful.

Created a second user account. The PC actually boots fast to the login screen and fast into Windows 10, however everything seems to work great except the Windows 10 start button and cortana. I can right click on the button and use it, but not left click or use cortana. I can however click on file explorer etc just fine.

Ran chkdsk /f, sfc /scannow, uninstall/reinstall graphics driver, no malware found, edit registry runonce processes per google, windows updates, uninstall antivirus and restart windows explorer in task manager, disabled all all startup items, uninstalled all hp software. Checking event viewer now for errors.

Note: This doesn't seem to be the same as the familiar "taskbar doesn't work at all" problem. Just the start button.
Note: There are no windows 10 drivers on the HP website for this model so cannot upgrade bios. Has an HP Mobo.
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Tom CieslikIT EngineerCommented:
Go to Windows event log and check which service is taking a long time to start or is not starting at all.
This maybe help you investigating issue.
JohnBusiness Consultant (Owner)Commented:
I suggest , given a damaged user profile , that you back up completely, and re-install Windows 10. Repair will not fix damaged profiles

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
RaminTechnical AdvisorCommented:
Probably the reason is:  Driver incompatibility with Windows 10.
5 Ways Acronis Skyrockets Your Data Protection

Risks to data security are risks to business continuity. Businesses need to know what these risks look like – and where they can turn for help.
Check our newest E-Book and learn how you can differentiate your data protection business with advanced cloud solutions Acronis delivers

mikesmithccsOwner/OperatorAuthor Commented:
Total CPU 0%, Total RAM about 9%
94MB Service Host Local System (Network restricted)
49MB Antimalware Service Executable
29MB Desktop Windows Manager
Are the top 3 memory processes
JohnBusiness Consultant (Owner)Commented:
Nothing untoward there, but the main user profile is damaged (you said), and so reinstalling Windows is the best (and really the only) way to fix this.
Tom CieslikIT EngineerCommented:
Any errors in System Event Log ?
mikesmithccsOwner/OperatorAuthor Commented:
One error repeatedly (20x) in event viewer after each boot:
Source: ESENT: Error: vcvhost (4808) Unistore Database (C;\Users\George\AppData\Local\Comms\UnistoreDB\sotre.vol: Index: 00000004 of table Partner item is corrupted 0

Also downloaded a Microsoft Start menu fixit which returns the following result: & are not installed correctly
However the fixit does not fix it
Tom CieslikIT EngineerCommented:
In this case maybe it would be smart to re-install Windows
mikesmithccsOwner/OperatorAuthor Commented:
Were reinstalling now. Will let you all know
JohnBusiness Consultant (Owner)Commented:
Author has accepted the need to reinstall Windows
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Windows 10

From novice to tech pro — start learning today.