Reinstalling Windows - Guild Wars too

I'm just wanting to get confirmed of this:

If I have to reinstall Windows and thus lose all programs that I own, does the product key code apply for reinstalling GW?

I know this is a stupid question but I'm not sure about it.

nope no need for the product key. Just install GW off the disk (and wait a while for the updates to download) and enter your account name and password as normal.

Thanks!

That's good news.

I recommend backing up Gw.dat and copying it over when you finish your reinstallation, it'll save time on patching.

this is exactly what i do saves hours of redownloading everything

Well, tbh I have naver downloaded any patches or other updates, for me the game seems to update itself every once in a while.

Exactly. It automatically downloads and saves the patches into one big "GW.dat" file. There are no stand-alone patches to download.