请把下面的用记事本另存为.cmd文件,双击执行.经过测试了的.多亏你提醒,我又增加了这个办法.
set acHKey=HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchScopes
reg.exe add "%acHKey%" /v "DefaultScope" /d "{00000000-0000-0000-C000-000000000006}" /f >nul 2>nul
set acHKey=HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchScopes\{00000000-0000-0000-C000-000000000006}
reg.exe add "%acHKey%" /v "Codepage" /t "REG_DWORD" /d "936" /f >nul 2>nul
reg.exe add "%acHKey%" /v "DisplayName" /d "百度搜索" /f >nul 2>nul
reg.exe add "%acHKey%" /v "URL" /d "
http://www.baidu.com/s?ie=gb2312&wd={searchTerms}" /f >nul 2>nul
reg.exe add "%acHKey%" /v "FaviconURLFallback" /d "
http://www.baidu.com/favicon.ico" /f >nul 2>nul
注意,上面的复制时不要断行.本回答被提问者采纳