DVD gets driver corrupt or missing error message

> Installed a new dvdrw to replace an existing cdr.
> Installed as master and older dvd as slave. Worked for a
> while, now neither driver installs - get 'Windows unable
> to install device driver - it is either corrupt or
> missing' error. I tried uninstalling/re-installing the
> dvdrw, the old cdr, the old dvd - doesn't seem to matter
> what I attach to the ide cable, I can't install it.
> I was thinking I might try repairing my install with the
> xp disk, but......no cd drive.
> Any suggestions?
> Thanks in advance, Rob