You are unfortunately in good company, as this seems to be a common thread with the Pitcairn and other southern Isles based devices from the period. It seems to be power-related, but no solutions have been found yet.
Please check out the thread here: Black Screen When Installing 17.12.2 Drivers HD 7870 Win 7 for the 7870 and some R9 devices.
I've tried almost everything, even flashing a R9 270x bios onto my HD7870 to see if I could override power profiles and get it to work, but so far nothing. Reinstalling windows does nothing, and some users here and elsewhere have even tried reverting to Windows 7 and 8.1 to the same effect. This makes me think we might be involved in some similar fiasco to what happened a few years ago, where drivers were killing cards left and right.
The only step I haven't yet tried is reflowing the solder on my card (either by baking or heat gun), as this is a last resort.
Come check out what we've been trying in that other forum post.
I've responded on the above link as well, though it isn't really specific to the 17.12.2 driver, so that title actually diverts from the real problem.