By same reason I cant get Network stumbler running over windows Vista. So after quick search in netstumbler forums I found this : Vistastumbler
Vistumbler is a netstumbler like program for Vista(or later…maybe).
You can find it on : http://www.techidiots.net/project-pages/vistumbler
Features
- Find Wireless access points – Uses the Vista command ‘netsh wlan show networks mode=bssid’ to get wireless information
- GPS Support
- Export/Import access points from txt file
- Export access point GPS locations to a Google Earth KML file
- Open Source
Here is a screen shoot : 
So it worked with VISTA Ultimate x64 and my intel 3945abg card.