Ok, this is really really weird.
I decided to install the updated version of iTunes (7.6.2.9), using the 64bit version install in the hopes it'd sort my inability to burn from CD's.
Unfortunately it's removed my DVD drive (Samsung SH-S203N) from my system with Device Manager reporting a "corrupted registry". Any ideas on how I can get around this (obviously I can just use system restore to get my driveback)?