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#21
@EmmaLouise:
When you upgraded to Windows 7, did you do and upgrade install, or a new install from scratch? Upgrade installs rarely go well, and something in the upgrade may have messed up the drivers. There is also a frequent registry issue with some laptop DVD drives, that prevents them from working right. That problem can show up in different ways.
I'll do a look around and see if I can find any details on that possibility.