Robster 400

i've had WDS 3.01 installed on XP SP2 a while now,but recently i cannot 
search the web from the taskbar box. when IExplorer opens, it has the correct 
search words and arguments, but fails to put in the search engines address (i 
use google) for example:

 http:/// %20how%20can%20i%20fix%20this  

i've tried setting IExplorer (7) default search from google to yahoo but 
still the same result.
Many thanks for any help.