Hi Dipak. I'm Greg, an installation specialist, 10 year Windows MVP, and Volunteer Guardian Moderator here to help you.
The error means either someone has blocked the change or could be an overprotective antivirus.
To check what is blocked in Chrome see here:
https://m.wikihow.com/Block-a-Website-in-Google...
I would uninstall any 3rd party antivirus in Settings > Apps > Apps & Features and try running only built-in Defender which gives adequate protection, best Windows performance, least issues, and is from Microsoft who knows how to protect their OS best.
After uninstalling antivirus in Settings > Apps > Apps & Features, restart the PC, then type Security in Start Search, open Windows Defender Settings, there and in Windows Defender Security Center fix anything that's flagged.
If you want the best on-demand scanner download and install Malwarebytes from
https://www.malwarebytes.com/mwb-download/
In it's Settings > Protection > Scan Options enable Scan for Rootkits.
Then on Scan tab choose Threat Scan and Run Scan.
Clean up anything found, restart PC and then run again until it comes up clean.
If you want to keep Malwarebytes as an on-demand scanner then you can disable its Real Time trial version in it's Settings > Accounts tab.
Next check for damaged System Files:
https://www.lifewire.com/how-to-use-sfc-scannow...
If it cannot repair them see Step 10 here to continue:
http://answers.microsoft.com/en-us/windows/wiki...
If it checks out and the problem persists then try resetting Chrome:
https://www.lifewire.com/how-to-reset-google-ch...
If that fails then try uninstalling Chrome fully, restart PC then reinstall from a fresh download:
https://productforums.google.com/forum/#!topic/...
https://www.google.com/chrome/
I hope this helps. Feel free to ask back any questions and keep me posted. If you will wait to choose if I solved your problem, I will keep working with you until it's resolved.
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Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.
