Isearch along with coolwebsearch is particularly hard to
get rid of, here are some suggestions:
Here is how to remove isearch from IE on XP:
in regedit search for/remove the following:
!!! ALWAYS EXPORT A COPY OF YOUR REGISTRY BEFORE
ATTEMPTING CHANGES!!!
HKEY_CLASSES_ROOT\CLSID\{1C78AB3F-A857-482e-80C0-
3A1E5238A565}
HKEY_CLASSES_ROOT\CLSID\{1C78AB3F-A857-482e-80C0-
3A1E5238A565}
HKEY_CLASSES_ROOT\iSearch.Object
HKEY_CLASSES_ROOT\iSearch.Object.1
HKEY_CLASSES_ROOT\TypeLib\{6D3F5DE4-E980-4407-A10F-
9AC771ABAAE6}
HKEY_CURRENT_USER\Software\iSearch
HKEY_CURRENT_USER\Software\Microsoft\Internet
Explorer\MenuExt\&iSearch The Web
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{1C78AB3
F-A857-482e-80C0-3A1E5238A565}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\iSearch.Object
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\iSearch.Object.1
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{6D3F5
DE4-E980-4407-A10F-9AC771ABAAE6}
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Code Store
Database\Distribution Units\{1C78AB3F-A857-482E-80C0-
3A1E5238A565}\DownloadInformation
http://toolbar.isearch.com/install/00010/initial.cab
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet
Explorer\Extensions\{1AE2F26C-8E23-4930-A68D-9E681A764001}
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet
Explorer\Toolbar
3A1E5238A565}
HKEY_USERS\S-1-5-21-329068152-1972579041-725345543-500
\Software\iSearch
HKEY_USERS\S-1-5-21-329068152-1972579041-725345543-500
\Software\Microsoft\Internet Explorer\MenuExt\&iSearch The
Web
It seems some of the HKEY_USERS ones dissapear after
deleting the first ones.