i think you should delete this(make system restore point before hand):
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://websearch.drsnsrch.com/sidesearch.cgi?id=
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://websearch.drsnsrch.com/sidesearch.cgi?id=
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = http://websearch.drsnsrch.com/sidesearch.cgi?id=
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://websearch.drsnsrch.com/sidesearch.cgi?id=
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.dell.com
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch = http://websearch.drsnsrch.com/sidesearch.cgi?id=
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = http://websearch.drsnsrch.com/sidesearch.cgi?id=
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = websearch.drsnsrch.com/q.cgi?q=
O4 - HKLM\..\Run: [NaviSearch] C:\Program Files\NaviSearch\bin\nls.exe
if this doesnt work then restore your computer to the system restore point you created early then post again(only if no one else with better advice posts here).
hope this fixes your problems. For more info you might wanna look in the windows tips and tweaks section where csgal might have written a tutorial on this.