Run an sfc/scannow command in an elevated command prompt. If errors are found, run it twice more with each scan followed by a reboot.
SFC /SCANNOW Command - System File Checker
Enable
Driver Verifier. Enabling this should hopefully crash your system and then point to the faulty driver that is causing problems. However before you do, it is advised that you
create a system restore point and
backup first.
Driver Verifier - Enable and Disable ASACPI.sys may be the cause of the problem. The pre-2009 version of the driver is notorious for causing BSOD's. From the below link, click on Utilities and download and install the 'ATK0110 driver for WindowsXP/Vista/Windows 7 32&64-bit'.
ASUSTeK Computer Inc. -Support- Drivers and Download P7P55D LE
The following
drivers need to be updated:
Code:
ADIHdAud.sys Wed Jan 17 01:05:27 2007
AEAudio.sys Mon Aug 07 23:59:46 2006
ASACPI.sys Mon Mar 28 13:30:36 2005
dump_nvstor64.sys Fri Aug 10 04:11:52 2007
nvmfdx64.sys Sun Nov 18 10:47:57 2007
nvstor64.sys Fri Aug 10 04:11:52 2007
Senfilt.sys Mon Nov 21 18:57:04 2005
spldr.sys Tue May 12 02:56:27 2009