>Well I finally sussed it out, unbeknown to me I had Firefox configured to automatically update and it installed a module called SearchProtect and this was causing the redirect to Yahoo, I found it by looking in installed programs and sorting on install date and there it was installed with yesterdays date, I uninstalled it, rebooted and received the proper ASP error ( there was a problem in my code ) fixed the error and bingo I'm back in business, this is bad behaviour by the FF devs and I will be telling them this is not acceptable.

SearchProtect is hijacker adware/malware by Conduit, not by FireFox. It usually gets installed as an already-opted-in add-on to other "free" downloads. For example some sites offering free PDF converters direct you to uPDF, which by default installs Conduit SearchProtect: http://www.updf.net/lp/conlp-en.php?lang=en&cid=4143 ( "About the installer" ). Those installers are *very* cunningly designed to maximize the chance you'll install the extra payloads. It's best to avoid those products entirely but if you must use them you have to be very careful to decline installation of the extras at every dialog prompt. If you accept the defaults, or miss one of the checkboxes (hidden low in a scrolling box) then it gets installed.

Chances are you or some other user of your computer installed a free download that included SearchProtect by default.

Check your list of installed programs, uninstall any you don't recognize or don't need. Sometimes 2 or 3 such products get installed, and even if you remove one, the others will silently re-install it. Self-healing behaviour for malware.

After all that, run a thorough antimalware scan.