Quali chiavi del registro hai controllato? Vedi se già non l'hai fatto anche in queste
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Start Page
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Search Bar
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Default_Page_URL
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Default_Search_URL
HKEY_USERS\Software\Microsoft\Internet Explorer\Main\Start Page
HKEY_USERS\Software\Microsoft\Internet Explorer\Main\Search Bar
HKEY_USERS\Software\Microsoft\Internet Explorer\Main\Default_Page_URL
HKEY_USERS\Software\Microsoft\Internet Explorer\Main\Default_Search_URL
HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Main\Start Page
HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Main\Search Bar
HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Main\Default_Page_URL
HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Main\Default_Search_URL
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Marco(amvinfe)