Er..... I would suggest returning that controller you just bought and consulting a tech in real life first.
Keep in mind that people can only help you so much on the internet.
Anyways, what exactly are you using to restart? Do you have a boot disk or something or are you actually booting from your WinXP CD?
If the computer is recognizing your hard drive now, then you should be able to put your WinXP CD in the drive, restart your computer, and start setup. You will have to push F6 and insert the floppy like you said, as Windows classifies high speed ATA controllers as SCSI/Promise controllers, which makes no sense.
Seriously though, how much did this controller cost you and did you price it against the cost of a new motherboard? =\