Problems detecting drives Dimension 4500 XP home

I am working on a Dell Dimension 4500 running XP home.  There are two problems that I think may be linked.

1. The autoplay feature does not work on either of the CD/DVD drives.  I have run Kelly's
autoplay fix on them and it comes up with no problems, but autoplay still doesn't work.
2. The second problem is with the hard drives.  I've just cloned the original C drive and made
the larger clone the master and the old drive the slave.  I've set the jumpers for master/slave
and put the master at the end of the connector and the slave below it.  Still when I boot with
both of them up the old drive comes up as C and the new one as F.  I've gone into the bios
also hit alt-F to redetect the drives but it still comes up this way. I've also tried it with all drives
set to cable select.
The customer is coming over in a few hours so swift help is appreciated.
Thanks,
Al