First off, try reinstalling AdGuard on your computer. If you need guidance, you are welcome to use our knowledge base article describing both the installation and removal procedures.
If these manipulations did not have an effect, please perform the following actions:
Press Windows+R on your keyboard. When the Run window opens, type in the following command: %systemroot%\system32\drivers\etc\hosts and press OK or Enter
Windows will display a prompt asking you what program should be used to open the file. Select Notepad and press OK
If your host's file contains these records, please delete them and press Ctrl+S to save the file:
Close Notepad, reboot your PC and check if the issue persists;