Thank you for posting your query in Microsoft Community.
I can imagine the inconvenience you are experiencing and will certainly help you in the right direction to fix the issue.
However, I would appreciate if you could answer a few questions to narrow down the issue in order to provide you with better assistance.
which web browser your are using?
Are you getting any specific error message/code while opening those websites?
Do you have any security software installed?
Have you check the issue in other browser? Was the result same?
Sorry, to know that you are facing this issue. If you are using Internet Explorer
then it might be caused due to changes in Internet Explorer settings, some add-ons also may cause this issue. If the issue is specific to some websites then it might be due to compatibility.
First try to run the fixit provided in the following article and see if it helps you to fix the issue. This fixit diagnose and repair IE problems that make IE slow, not secure, unstable or crash, caused by add-ons not working or inappropriate security
If Fixit doesn't help, let’s try these methods and check if it helps:
There could possibly be a problematic add-on which might be causing the problem. Let’s try the following to see if an add-on is causing this issue. We can do this by running Internet Explorer in
No Add-ons mode. If the problem is not present in No Add-ons mode we can diagnose that it is an add-on that is causing the issue, and from there we can take steps to locate and disable the add-on. To open
Internet Explorer in No Add-ons mode, please do the following:
Open the desktop, and then tap or click the Internet Explorer icon on the taskbar.
Tap or click the Tools button, and then tap or click
Under Show, tap or click All add-ons, and then select the add-on you want to turn off.
Tap or click Disable, and then tap or click
Manage add-ons in Internet Explorer
For more clarification you may refer to the link provided below.
If issue persists, try to delete the browser cache and check the status of your issue. Follow these steps to do so.
a. Start Internet Explorer 11.
b. On the Tools menu, click Internet Options. If you can't see the Tools menu, press Alt to display the menus.
c. Click the General tab.
d. Under Browsing History, click Delete.
e. In the Delete Browsing History dialog box, click to select the following check boxes, and then click
Delete: Temporary Internet Files , Cookies , History
f. Click Close, and then click OK to close the
Internet Options dialog box.
If issue persists and the issue is specific to some websites then I would suggest you to open that websites in compatibility view and see if it helps.
Open Internet Explorer 11.
Open website which is getting blocked.
Press alt key to opentool bar.
Now click on tools.
Then click on Compatibility view settings.
You will see the name of website
under Add this website, so click on
add to add this website.
Close the window
and restart your computer.
Hope this would help. If issue still persists post back with the information required, current status of your computer and result of the proposed suggestion, we will be happy to assist you.