I am trying to install XP on a Dell PC but having trouble installing it because the set up wont find the hard disk, I dont have a floppy disk drive in the machine to "F6 and install third party drivers" and I cant slipstream using nLite because this Dell PC wont allow me to boot from CD, and it is set to Boot from CD in the BIOS. 
A number of Dell PC's are like this, do Dell stop you from doing this?
What can I do?

A number of Dell PC's are like this, do Dell stop you from doing this?
What can I do?