Crash several Times

My XBMC is crashing all the times, and I dont know why. On my second Computer everything is working very well.

1. PC
Asrock Z68 Pro 3
16GB DDR3 1333 MHZ
i5 2400
AMD Radeon HD6450 via HDMI to LG 50PX950 (50 Zoll Full-HD)

DVBSky S952
2TB WD Green
2TB Samsung EcoGreen
1TB Raid 0 (2x Samsung Spinpoint 500GB)
64GB SanDisk SSD


Second PC:

Asrock Z68 Pro 3
8GB Corsair 1600 Mhz
i5 2500K
128 GB Samsung 830
1TB Samsung F3
300GB Maxtor
AMD Radeon 6950 via DVI to Acer 240*** 24 Zoll Full HD

On the Second PC everything is working very well. The First PCs XBMC is hanging up after 5-6 Minutes.

Heres the Errorlog: https://rapidshare.com/files/2029989462/...2.0-ALPHA6 Git_20120909-74be277-20120910-220955.dmp