Reset Default Browsing settings:https://support.mozilla.org/en-US/kb/reset-firefox-easily-fix-problems?utm_expid=65912487-41.djHNRQY0RhaLvvtvcd0BQA.2&utm_referrer=https%3A%2F%2Fwww.google.ca%2F
Clean the Firefox Cache.https://kb.iu.edu/d/ahic#firefox
Reset Internet Explorer:
Menu > Tools > Internet Options > Advanced Tab.
Click the Reset button on the bottom of the pane.
Click the Apply button.
If the problem persists Download and run this cleaning tool.
Temporarily disable your AV program so it does not interfere.
Info on how to disable your security applications How To Temporarily Disable Your Anti-virus, Firewall And Anti-malware Programs - Security Mini-Guides
Download Zoek tool from here
When the download appears, save to the Desktop
On the Desktop, right-click the Zoek.exe
file and select: Run as Administrator
(Give it a few seconds to appear.)
Next, copy/paste the entire script inside the code box below to the input field of Zoek:
any open Browsers.
Click the Run script
button, and wait. It takes a few minutes to run all the script.
When the tool finishes, the zoek-results.log
is opened in Notepad.
The log is also found on the systemdrive, normally C:\
If a reboot is needed, the log is opened after the reboot.
Please attach the zoek-results.log in your reply.
Also, please provide an update on how the computer is behaving after running the above script.