I did, but it was a while ago.
Could it be that all the updates MS has supplied for your Win 7 Installation have moved it too far from the original DVD for that to recognise what it is?
I have a vague recollection of a way to produce a new DVD based on your "now" installation, but haven't tried to do that.
I do have a Knoppix-on-a-stick which has in years past been a very useful tool to recover damaged hard drives. Again, not done that for a while - I have my own simple-but-effective weekly backups to external hard drives.