Navigate the the location below in your registry and make the corresponding change.
Change the value of default to equal the URL for the search engine, enter "%s" where you wish your keyword to be placed in the URL.
For example, Google.Com would be: http://www.google.com/search?q=%s
MSN would be http://search.msn.com/results.asp?RS=CHECKED&FORM=MSNH&v=1&q=%s
Key: [HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchUrl]
Value Name: (Default)
Data Type: REG_SZ
