I also have Google toolbar installed on both.
When I search on the PC address bar through the toolbar (it does not matter what I type in the Google search area of the toolbar) two IE sites open. One with whatever I am searching for and the other 'blank' as that is optioned in my internet options homepage.
Although both computers live in different rooms in the house, I brought the Laptop in and matched the internet options on it with the PC, and although they are identical the Laptop does not open two homepages, the PC still does.
Although this is not an earth shattering error, it is annoying, so has anyone got a suggestion why this would be please.