cazzy, if "something has been messing with your registry keys" you almost certainly have or had a malware infestation.
It's not entirely clear to me what you mean by "eradicted them all." Does "them" refer to altered registry keys? If so, you may have traded one set of problems for another.
I understand that you just want to get your burner working the way it used to, but trust me, the first thing you need to do is make sure you've got this bug totally eliminated. Until you sort the malware out you'll have one problem after another. First follow to the letter all of Sandi's instructions on that webpage I linked to. If you have any doubt at all about whether you've been successful, post your story in one of the forums she links to. The people there are very experienced and incredibly patient.