It is simple, when you insert the CD-RW into your Vista, or XP machine for
that matter, auto-run will ask you whether you want to format the CD or not.
It should anyway, but if it doesn't, here is another way. With the CD-rw in
the drive, go to "My computer", right click the drive that has the CD-RW in
it, and on the menu that comes up, click "Format"
That being said, a couple things, if you are doing this in windows. Before
you do all of that, right click on the drive, and select "Properties". When
the properties box comes up, select the "record" tab. Make sure the box that
ways "Enable this device for recording" (or something of that nature), is
checked.
Now, there is a simpler way of doing this, you can get a 3rd party software
that will take care of all of this for you. I am using Ashampoo, in Vista.
For XP, I use Nero 7 Ultra. Nero comes with INCD, which does all that and
more. But hey, teh choice is yours.
Hope this helps.