Question

Certificate errors on all browsers ( chrome,Firefox,edge,ie)

Problems

1. err_cert_authority_invalid on chrome
This connection is not private on edge, chrome
Http 500 on internet explorer


2.Automatically some web pages open up (amazon ,snapdeal,evo trackr, onclickads )
3.And sometimes Skype is installed without my permission.
4. System security is disabled after login even if I turn it on it goes to disabled mode, defender turns off

Attempted solutions:

I have no problems with my date and time ,it is set as per internet and it is accurate.

Extensions: no recent extension,removed all of them
Problems

I even installed adwcleaner, avast pro,malwarebytes and removed all possible threats.
I tried all these in safe mode also

Please someone suggest a solution without reinstalling my windows 10

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Comments
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Answer
safemode with network
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lenovo s510p

i tried safemode with networking, but i cannot connect to internet.
after diagnosing it says " network diagnostics cannot be run on safe mode"

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Answer
Items 2 and more tell me some spyware or worse is installed.

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