Heya, Cristalle.. when you install an new XP it pays not to let it see the old one... you should have removed the old disk first.
Then you would have got the OS installed in E: [M$ boot drive] and D: set as the M$ system drive with the loader files in it.
Ah...
"Windows XP Professional"
"Windows XP Professional" .. that would be the boot.ini file on C:.
"C was always (System)" .. that means it would have been Active also, but Active does not show if it is set on the System drive. There is only ever one Active partition if you are using Windows to set things.
Your cd must have been working a bit ago, try checking the cables which may have been dislodged when you inserted the new hd.... I do not know why you are seeing the BBS bootROM as a boot device, cos you have the IDE disks available, but ignore it.

In the first post to you I forgot to tell you to set IDE-0 as boot drive after copying in those files to D: and making the new boot.ini file for D:.
It should have gone in here:
...note those two partition(2)....
-save it to D:\
Hide those OpSys files again.
Restart. ** Set boot order to IDE-0 first.** Might work.

-doing that should be sufficient to get it to boot using D:, then you can delete those files from C: