It's not that MicroSoft removed F8 from Windows 8, they've sped the boot sequence up so much, it is practically impossible for you to press it fast enough to get into Safe Mode.
I was hoping that the built in restore sequence from Dell would give you the option of a repair.
I had another thought. You maybe able to get the OS to prompt you for a boot to Safe Mode. Let Windows start booting and then hold the power button in to force it to shut off during the boot. This should trigger a Windows flag then next time you start it and ask if you want to do a repair, safe mode, etc.
Sorry I didn't respond right away, I wasn't ignoring this. I work in Yemen, live in Canada and I was travelling home Tuesday/Wednesday. Long trip, but I'm not as jet lagged this time around. I think I got a little more sleep on the plane this time.