Chrome allows domain administrators to configure policies for the browser. These policies can configure or restrict the browser (e.g. configure the network proxies, install extensions, and also block some sites).
You'll get policy management in two cases:
1) if you signed-in with an account that your company/school/administrator gave you
2) if the machine you're using is managed by your company/school/administrator
You can inspect these policies at chrome://policy; "URLBlacklist" is the policy that restricts access to sites. If you believe you shouldn't get any of these restrictions on your laptop then this could be either malware or a (very serious) bug in Chrome.
Can you answer these questions to help us diagnose your problem:
- what is the operating system version? (Windows, Mac, ChromeOS?)
- are you signed in to Chrome? If so, are you using a gmail account or an account managed by some domain?
- is this a company/school laptop?