BSODs, varying codes

So verifier caught nothing.
Disable it. Let the computer run freely.

It feels bad that there remained some problem but I am failing to get it. May be if it crashes again in its normal usage, it will contain some more info

You are highly overclocked.

Code:

CPUID:        "Intel(R) Core(TM) i7 CPU         860  @ 2.80GHz"
MaxSpeed:     2800
CurrentSpeed: 3685

As you are getting BSODs, you should stop overclocking and use the computer with the normal settings of CPU, GPU and RAM. Stop overclocking and set the BIOS to default.
How To Clear CMOS (Reset BIOS)

At the same time, your BIOS is very old.

Code:

BiosVersion = 0209   
BiosReleaseDate = 07/28/2009

Update your BIOS to Version 2101, dated 2012.11.06 (ASUS P7P55D).
ASUS P7P55D

Let us know how the system is running when these are done.

You are welcome mate :) Good to know that the computer is working stable now.

If there is any further issue, let us know :)