Hi, This is very odd. However the home page that you are being sent to, is the standard Microsoft page and therefore is safe for you.
But if you really want to alter it, then a spot of Registry editing might be indicated.
If you are experienced at editing the Registry you will know that the first thing to do, before you do anything else is to back up your Registry. A useful tool for this , called ERUNT can be downloaded from here:
Please read all the instructions especially how to put your old registry back to what it was! (print them out if necessary)
Once operating in the registry you are operating outside of the usual comfortable safe Windows environment where if you issue a certain command, Windows may suggest that it might not be a smart move to execute it, or will check back by saying "are you sure you want to..." etc Once in the registry if you issue a command, it will be executed instantly, without question, even if in so doing, it wrecks your system and renders it unbootable.
Now would also be a good time to set up a System Restore point and whilst you are taking all these safety precautions take an extra moment or two just to check that your back up/archive/copy of all important stuff, files, data, settings etc is 100% up to date, accurate and reproducible.
Now if you go here:
you should be able to make the required registry changes.
If this is successful then your home page should remain fixed, but if you are still having problems post back here in this thread and we will advise on Plan B