Ok I am setting up SQL Server Express 2008 R2 and I am at the following screen:

What do I need to do here. Can I just press next? I'm guessing if I press next it will work but is this what you're really supposed to do?
Basically I don't fully understand what's going on here and I don't just wan't to keep hitting next as I know it will come back to bit me in the ass later.
Thanks