Assuming you have no issues with your game currently, I agree with previous posters, copy and paste
If you have an ext hdd, copy your entire wow folder from c:\users\public\games and drop it back on your new windows installation. Wow is ABOUT 30 GB give or take. Everything will be preserved, addons, configurations, preferences, etc. And its MUCH faster than having to redownload, install and patch the game, especially if you use multiple addons
Pro tip: don't reinstall. Copy the installation to an external harddisk and then copy it back in. WoW will repair itself the moment you run your launcher for the first time on the new Windows and you are done. Tested this myself many times, it works.
Copying the game back and forth can take up to two hours, if not more, over USB.And its MUCH faster than having to redownload, install and patch the game, especially if you use multiple addons
Simply reinstalling the game to the point of playability will take 20 minutes.
Backup of addons and wtf takes.... 25 seconds. Downloading wow takes 20 minutes tops, unless you're on dialup. Having a nice clean install of wow not only takes less time, but ensures that little bugs that simply repairing wont fix, are handled.
Copy your WoW folder to an external HDD. Can copy it about, it still runs wherever.
The difference between stupidity and genius is that genius has its limits, whereas stupidity does not...