your correct, generic drivers for most mobo are in windows but not the specific drivers and vendor drivers are going to work best for the mobo. It doesn't say vista because to say win 7 implies vista, but then again vista had many many problems.
Norton IS is general a one year subscription but can be up to 3 now I believe you would want to check you product key with Symantec Norton.
It is compatible with Windows 7. Windows 7 will have generic drivers for most Mobo but will not run them to peck. So if you do not have the Driver disk for the Mobo don't fret you can install windows and then download the drivers from that manufactures site