I have been searching this and have looked at all of the common "fix's" tried to start in safe mode ran scans no items found and deleted my cookies cleared my cache etc. nothing works permanently a few minutes at most . I can browse without any problems in IE but would prefer to use firefox but cannot access anything to do with Yahoo search, My Yahoo.
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Create a new profile as a test to check if your current profile is causing the problems.
See "Creating a profile":
If the new profile works then you can transfer some files from an existing profile to the new profile, but be careful not to copy corrupted files.
Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.
I have retored and reinstalled firefox in the past 24 hours neither one worked i also deleted all files and folders asociated with firefox before reinstalling. At first this problem seemed to be only affecting my user but is affecting all users on my computer
Did you try to boot the computer in safe mode?
Do a malware check with some malware scanning programs on the Windows computer.
You need to scan with all programs because each program detects different malware.
Make sure that you update each program to get the latest version of their databases before doing a scan.
You can also do a check for a rootkit infection with TDSSKiller.
none of this has been helpful and looking at other questions like "yahoo has taken over...." im not the only person experiencing this and some posts there describe my situation exactly. also if you look at my original post I start off saying ive already tried the most common fixes