Yes, it should be. If it isn't then it should take just a little tweaking in M.S.E. to get them to play nice with each other.
Obviously. Vista can do anything.
World of Warcraft is listed as compatible with Windows 7, and should work fine.
Yes
World of Warcraft is available only for the PC and MAC, it has not been released for a DS, nor would it be compatible or playable.
Gnomeland Security
Yes, all Blizzard games are compatible on both Mac and Windows machines
You have to create another character and choose to be a worgen or change your race to worgen if your class is compatible with that race.
yes
Warcraft two is available for the PC. The original game was programmed for DOS, but worked well using Windows 95. There was also a version available for Macintosh. You can use a LAN line to play with up to eight other players. It is not available for any to the console style machines.
If you try altering the World of Warcraft Client, Blizzard's security software, Warden, will detect it and refuse to connect. Sorry, but botting and hacking are just not allowed in WoW.
If it is compatible with your pc's audio system, then it should be OK to use for World of Warcraft. WoW does not need any special type of audio system to work, it just uses your systems audio device.
As of now the Wii is not compatible with World of Warcraft but I'm sure if one had a degree in computer engineering you could rig it to work.