You should have been asked to update the previous installed SuSE.
And that would have been the right option for you.
So as stated in Response 1, Boot from the Windows Installation CD, run recovery console.
At console prompt run bootfix and fixmbr.
From now on, your system should primarily start windows.
Then, back in Windows, you can delete the SuSE partitions and if you like, install ONE new SuSE.