You can order replacement media by calling Support or by using this form (I would recommend the form first): support.dell.com/.../backupcd_form The Drivers disc doesn't do you any good without the OS disc. You might be able to "restore" it by following the instructions below, but you would still need an OS disc to do so: support.microsoft.com/.../971760 You can also upgrade to Windows 8 Pro and run the same Hyper-V software from within Windows 8. If you want to dual-boot, you just need to remember that each OS needs its own partition.
I bought a 660 a few days ago and wanted to play around with adding a VM.  I installed Hyper-V from the MS website, but I must have installed it onto my windows boot partition because now it boots to Hyper-V and that's it. I get a nice DOS prompt and that's all. Looking around on the drive via my friend DOS prompt, I can see Windows and Windows.Old on the C:.  Since I can see the Windows.old I am hoping there is some way I can undo my little experiment.  (On the plus side, I had not installed anything significant on the machine, so I can afford to blow it all away.) So how do I go about reinstalling Win8?   Thanks!  
Reinstall Win8 after Hyper V goof