DVD write problem

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I have run out of blank DVD's and my legal copy of windows 7 has almost finished downloading. All my DVD's that I have put stuff on have write protection on, so I cant add/remove files from them. Is there any way to turn it off again? If not would I be able to run the windows 7 setup from a memory stick?

[Recursion]

For a start, are they even DVD-RWs?

And yes, just follow a vista guide but substitute it for W7.

http://kurtsh.spaces.live.com/blog/cns!DA410C7F7E038D!1665.entry

[Decode]

For a start, are they even DVD-RWs?

And yes, just follow a vista guide but substitute it for W7.

http://kurtsh.spaces.live.com/blog/cns!DA410C7F7E038D!1665.entry (http://kurtsh.spaces.live.com/blog/cns%21DA410C7F7E038D%211665.entry)
I think they are DVD rewritables, When I put the files on for the first time it gave me the option to use a live file system or permanently write the files to the disk.

I think I will install if from a memory stick, thanks :)

[Recursion]

I just got that for a DVD that wasnt a RW.