Cannot Install NI-VISA Driver in Windows 7

Question

Hi all,
Software is not exactly my strength, so I apologize if this question is poorly worded or trivial.
I am trying to use NI-VISA 4.6 to create a driver for a USB mouse.  My eventual goal is to read off the raw positional data from the USB rather than read the mouse's position on the screen.  This way I will be able to use the mouse to track distance traveled without having to worry about the cursor going off the edge of the screen.  My VI will be working roughly along the lines of this one, which was so kindly offered by Intaris on this thread.
I am running into problems installing the driver I created with NI-VISA mostly following directions from here.  I created the .inf driver and copied it to C:\Windows\inf.  Since I am using Windows 7, I copied the Vista driver rather than the driver for earlier versions of windows (another user on the tutorial I linked to above said this worked).  I selected my .inf file and clicked "install" from the right mouse button drop-down menu.  I received an error message the first time I tried saying that the driver was not verified and proceeded anyway.  No .pnf file was created in the inf folder (as I believe that it should have).  I tried updating the driver for this particular mouse to the new driver I created in the device manager.  Windows resisted, saying that it already had installed the best driver for the job.
So now I am not exactly sure what to do.  I believe that other people have figured out how to get this to work, but I am clueless as to what I can do differently.  Does anyone out there know what might be wrong?  Does there need to be a .pnf file in order to get the driver to work?
Thanks
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Answer 1

Thanks for everyone's help.  I think I finally found the solution .
I did a lot of fumbling with Windows and eventually I got a driver I created in NI VISA to be accepted.  Since the whole thing was hacked together, I am having trouble determining the steps that got it to work.  I am not sure that this list of steps is either entirely necessary or complete, but in the interest of helping out people with a similar problem, I will try to explain what I did to get the mouse to be read.
The key was probably uninstalling the mouse that I wanted to use for the project.  I did this in the device manager, and then found the USB root hub that was running my device.  I updated the driver through here rather than through the "Mouse" section.  The information on how to do this is explained in more detail in these two KnowledgeBase articles:
http://digital.ni.com/public.nsf/allkb/28C5E7D2E9F​BB4CC86257536005A3692
http://digital.ni.com/public.nsf/allkb/3C335141B64​C038886257141000036F2?OpenDocument
I created the NI-VISA drivers and saved them in the default folder (under MyDocuments/National Instruments/NI-VISA) and installed them from there.  I am not sure if the installation step was necessary.  Then I updated the drivers as explained in the second linked KnowledgeBase article listed.
I think that the crucial step was uninstalling the mouse in the Device Manager.  This might be the "firmware" mentioned in the KnowledgeBase article linked below, but the wording is so ambiguous that I thought I would have to uninstall the drivers.
http://digital.ni.com/public.nsf/allkb/273BB58D3B5​2CE6886256F3B00714D03
Thanks again for the help
-David