If you had an old (bundled) Nero with a prevois drive, the embedded serial ties it to that drive - if your new drive included Nero, you'll have to uninstall it and reinstrall the new one.
Nero V5.5 used the "BUNDLE" scheme, tieing by drive, and possibly to express only.
Nero V5.0 often had an OEM version that was not committed to any particular drive.
Nero 6.x seems to be uncommitted, with OEM suite 1 (very lightweight) and OEM suite 3 (a "full" express version) available online **genuine** at very low prices - to be correct, it SHOULD only be sold with a drive.
Beware of idiots selling 20 programs including a full (non-updateable) Nero 6 on a DVD - why is it non-updateable, because it's PIRATE, and the serial is void in later releases - the guy I'm thinking of (no, I DIDN'T keep the address) is supposedly an Ebay "power seller" - all the Ebay assurances and badges mean NOTHING - so long as they keep getting thier listing fees, they don't care!
For wav editing (but without some of the trimmings), take a look at
http://audacity.sourceforge.net/ or
http://biphome.spray.se/baxtrom/soliton.htm - at just a 296Kb download, surely worth a try.