The BSOD was caused by your graphics driver:
Name NVIDIA GeForce GT 540M
fffff880`0f088000 fffff880`0fcffc00 nvlddmkm
Fri Jun 17 05:08:19 2011 (4DFAC523)
Also update these drivers:
Intel(R) Mobile Express Chipset SATA AHCI Controller
fffff880`01008000 fffff880`0115c000 iaStor
Thu Jan 13 02:50:12 2011 (4D2E5A54)
Wacom Mouse Filter (Bamboo)
fffff880`043f6000 fffff880`043fe000 wacommousefilter
Fri Feb 16 19:12:17 2007 (45D5F401)
Realtek PCIe GBE Family Controller
fffff880`04800000 fffff880`04875000 Rt64win7
Thu Apr 21 20:15:33 2011 (4DB07445)
Atheros AR9287 Wireless Network Adapter
fffff880`04889000 fffff880`04b2f000 athrx
Tue Jun 21 10:03:39 2011 (4E00505B)
Ricoh PCIe SDXC/MMC Host Controller
fffff880`04b3c000 fffff880`04b5a000 risdsnxc64
Fri Dec 17 13:45:48 2010 (4D0B5B7C)
Ricoh PCIe Memory Stick Host Controller
fffff880`04b5a000 fffff880`04b7c000 rimssne64
Thu Oct 21 03:33:06 2010 (4CBF9852)
Renesas Electronics USB 3.0 Host Controller
fffff880`04bba000 fffff880`04beb000 nusb3xhc
Fri Dec 10 05:50:35 2010 (4D01B19B)
ArcSoft Webcam Suite
fffff880`06a2e000 fffff880`06a38000 ArcSoftKsUFilter
Mon May 25 10:27:31 2009 (4A1A5673)
Intel Management Engine Interface (Chipset)
fffff880`0f06a000 fffff880`0f07b000 HECIx64
Wed Oct 20 01:33:43 2010 (4CBE2AD7)
Uninstall or update the Citrix Secure Access Client.