Provided the disks and controller are not physically trashed you
may be able to recover.
Pull the power connectors (NOT the data connectors) of your RAID 0 pair.
Stuff in a new hard drive (not so easy with the Dell) and install your Windows on it.
Make sure your BIOS is set to boot from that drive and make sure you can boot from it reliably.
Go to
ReclaiMe Free RAID Recovery software and read everything very carefully.
Download "ReclaiMe Free RAID Recovery" and install.
Powerdown and reconnect the power connectors for your RAID pair.
Reboot and IGNORE Windows offers to format your drives!
Run ReclaiMe Free RAID Recovery and see what you get.
Good luck (I am NOT responsible if you lose the whole lot)
Mac