I'm running Windows 8.1 Preview and I keep getting the " uncorrectable error" message. I thought it may be a hardware problem but after running memtest86 I found nothing. I've checked my drivers and they're all up to date to my knowledge. Any help would be appreciated, thanks. My system is an Asus Z87-Pro Motherboard, EVGA Geforce GTX 770, I-5 4670k, 8gb Corsair Vengeance RAM, WD 1TB Hard Drive, Corsair Gaming Series 700 Watt Power Supply. I use a Cooler Master Storm Scout 2 Case. I've checked all my internal temperatures and they're also fine, all my fans are working well.