do you have the original tomtom installation disc etc then? It offers WM as an option upon installion, connect it all up - usb/memory card whatever, and try and install it off the tomtom cd.
you do know you could be using the inbuilt gps on n95?
One thing to be aware of is that Tomtom will NOT work with the Samsung Omnias internal GPS without using a a virtual port manager. I use GPS Gate with Tomtom Navigator 7.450 on the Omnia and am very pleased at it's performance.