In Internet Explorer 7 you can set Search Providers. I do use the Google Search provider. When the Search Provider is set, you can enter your search criteria in the Instant Search box and press ENTER. By default the UK Google is used for this.
As a Dutch, I however prefer the Dutch Google. I found that this can be done by editing the registry. Just search the registry key: HKCU\Software\Microsoft\Internet Explorer\SearchScopes
Here you find the entries for the currently available Search Providers in your Internet Explorer 7.0. Now look into the subkey containing the Search Provider with the DisplayName "Google" and adapt the URL to your preferred Google setting. In my case:
Now you can use the custom Search Provider in Internet Explorer 7.0