Reset HOSTS file
https://support.microsoft.com/en-us/kb/972034
The instructions for W8/8.1 are the same as W10; see the link above for screenshots.
You want to delete the following entries (if they remain):
Here's how to do it:
Navigate to your HOSTS file:
In the search bar, enter
Code:
%WinDir%\System32\Drivers\Etc
Open the folder.
Copy the
hosts file to your desktop.
Rename the file in the original folder to
hosts.old
On your desktop, open the hosts file with Notepad.
Remove the entries if they still exist. Save as
hosts with no file extension and change the file type to "all files".
Copy the new
hosts file back into the original folder. Once all is verified working well, you can delete the
hosts.old file.
Flush DNS
Open Command Prompt and type the following command
Press enter.
Remove all Restore Points and create a new one.
Type Create Restore Point in the search bar.
In the box that opens (System Properties) Select
Configure. Verify System Restore is turned on for your OS drive. If not, turn it on in the next step: select the radio button to
Turn on system protection.
Select
Delete all restore points for this drive. Click
OK. Make sure Local Disk C: System Protection id
ON. Click
Create and set a new restore point - call it Clean.
The instructions from @
Slartybart are also a good idea to perform.
After these, please report how the system is running.