I guess you are posting from a Mobile because your desktop does not work.

• Is your desktop Windows ?
  I note you mention Internet Explorer.

Clearing Firefox History should not have the effects you describe.

I am wondering if it is a Malware problem.

• see Troubleshoot Firefox issues caused by malware

First of all ignore Firefox see if you can start Windows in its own safemode (F8 at boot - unless Win8 think that may be shift F8). Try without then try with networking options. If that works try Internet Explorer.

• http://windows.microsoft.com/en-us/windows/start-computer-safe-mode#start-computer-safe-mode=windows-vista

Post back with how you get on. Are you

• At least able to start the computer ?
• Able to use IE ?

Hi John99, Thanks for taking the time to post.....appreciate it! Yes....using iPad!

I cannot access the Internet via Mozilla or windows Internet explorer!! Wireless Internet is running but says page cannot be found!!

Link to Internet has somehow been disabled!! If I try and uninstall programs Internet explorer stops then shuts down!! This also takes out Symantec and my wireless connection! I cannot uninstall norton antivirus either!!

Really weird.....cannot restore windows either via system!! So need to get my PCM working! Bev

Create a new profile as a test to check if your current profile is causing the problems.

See "Creating a profile":

• https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues

If the new profile works then you can transfer some files from an existing profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over the problem.

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.

Download a fresh Firefox copy and save the file to the desktop.

• Firefox 23: http://www.mozilla.org/en-US/firefox/all.html

Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.

• Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you lose personal data like bookmarks and passwords from profiles of other Firefox versions.

Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.

• (32 bit Windows) "C:\Program Files\Mozilla Firefox\"
• (64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"

• It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
• http://kb.mozillazine.org/Uninstalling_Firefox

Your bookmarks and other personal data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.

• http://kb.mozillazine.org/Profile_folder_-_Firefox
• http://kb.mozillazine.org/Profile_backup

• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

Did you try WINDOWS safe mode from F8 ? did it work ?

• did the computer start
• even without Networking on did IE or Firefox at least start ?
• confirm if you are at least able to get to the Windows control panel ?