Hello,

please see this Firefox won't start - find solutions

Hi, I have already checked that but none of them seem to help.

Try this article. I'd just advice you to read the full article first and then proceed with the solution given in there.

http://malwaretips.com/blogs/www-search-net-removal/

There are a couple of software mentioned to scan...you can choose not to download all of them if you problem is solved with first one itself, but it still is up to you.

Just reply whether it solved the problem; in case you give it a shot.

Can you use the Profile Manager to create a new profile?

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