IE home page

evry boot the home page is changibg (to the same one). in regedit i am modifying the – home page searchassist – serchurl – SearchPage – Search Bar – default value – customizesearch
of the HKEY current user and local machine
to the old values but on the next boot it change again.
i have backup of my hd from last month so i backedup the System Data using backup tools of this hd and restore it on the other hd (the one that keep changing the home page)
but still the same. I APPRECIATE VERY MUCH YOUR HELP(i am gona crazy with one) Thanks