DVD drive shows up as CD drive

I daresay this has come up before and maybe someone can direct me to a more
appropriate forum if they don't know the answer.

I have a Dell Dimension 2400 which came with a CD drive. I replaced that
drive with a DVD recordable drive manufactured by Philips. For a long time
it worked without a hitch, but now it shows up as a CD-recordable drive and
the software won't let me copy DVDs. There is no way - that I can find - to
select a different driver for it, one that is suitable for a DVD recorder.

I would guess that the solution may involve tweaking the registry in some
way?

I'd buy a new DVD drive but only if I could be sure it would solve the
problem.