While playing audio, using either WMP or MPC, the system may hang, with a reboot the only option. This can occur after just minutes, or hours. It's then evident that the NTFS is corrupt on both the SATA drive (Win 8) and an SSD drive (W7) - all partitions. CHKDSK /f fires up. Otherwise the O/S runs as well as one might expect for a beta. Event viewer gives no clue to the problem. The processor is a capable 2600K, latest drivers. W7, using exactly the same soft/hardware is problem free.