I recently upgraded my Latitude E6500 from XP to Windows 7 Professional 64-bit. One of the 2 drivers that was not recognized out of the box was the one for the fingerprint sensor.
My first stop was obviously the Dell Latitude E6500 Drivers and Download page from DELL Suport, selecting Windows 7 64-Bit as the Operating System:
I tried with and without my Service Tag. After googling for a while, I found out that the driver is included in the "Dell Security Device Driver Installation Package for 64-Bit Operating Systems". It was hard to find a link to download the latest version of this pack which was compatible with the Latitude E6500 and Windows 7 64-bit, but I finally found it here.
The latest version as of 8/24/2010 was version 1.4.056, A18 released 6/28/2010 and the downloaded file name was: Dell_ControlPoint-Security-D_A18_R269916
You will need to download and install the Dell ControlPoint Security Manager, which includes the EMBASSY Security Center required to use the fingerprint sensor to log into Windows. That too was difficult to find
Latest version as of today was version 1.4.00004, A18 released 7/28/2010 and dowloaded file name: DELL_CONTROLPOINT-SECURITY-M_A18_R276445.exe
You may also want to update the ControlVault firmware (the installer recommends it). I did it just to be safe, though I'm not sure if it was really required. Latest version: 14.x.132.0, A17 released on 5/3/2010
I'm not really sure why these versions and not listed on the Window 7 64-Bit drivers page for E6500, but it sure took me a while to find them on the DELL Support site. I was ready to give up on the fingerprint reader, but I can now confirm that it works prefectly using Windows 7 64-Bit on my Latitude E6500!