I recommend contacting DELL for this issue so; they can help you setting up Intel Rapid Start Technology. There are different steps that need to be performed before the installation of the Intel Rapid Start Technology software otherwise it will not run properly.
Finaly I found out how this error occurs. It may be a bugg in the intel rapid start technology...
I bought a new laptop because my old one was crashed. I bought a HDD docking station so I could easily transfer the files of my old HDD (sATA) to my new laptop.
Now, if my docking station is enabled on startup, i get the error "Your system does not appaer to have intel rapid start technology enabled".
That's because the laptop thinks my external HDD from my old laptop is an internal HDD. And on that HDD, the rapid start technology is indeed not enabled...
I hope this is a helpful answer for people in the same (exceptional) situation like me!