Random computer shutdown

Almost every evening my computer shuts down and reboots. Then an error message shows up

The system has recovered from a serious error.

when I click on the more detials, I get this

BCCode : 1000000a BCP1 : 00000250 BCP2 : 00000002 BCP3 : 00000001
BCP4 : 804FCE4A OSVer : 5_1_2600 SP : 3_0 Product : 768_1

Any idea on how I would trouble shoot this?

If the system temps are okay, and the power supply is adequate then download and run memtest86+ from http://www.memtest.org/, or just swap out the ram you have to test the sticks individually if you don't want to use memtest. I would say that's where the problem is.

The error code A is more likely to be associated with a bad driver or incompatible software.

Did you install any new software before this problem started?

What anti virus and/or third party firewalls are you using?

Not sure on recent software but I had recently installed new RAM

using AVG antivirus and Scotty On Patrol firewall software

Welcome back. That security software should be ok. To see what is going on when the BSOD happens please follow this to attach you minidump files to your next post so they can be analysed.

have now enclosed the minidump files

First, have you carried out the checks that Tekgun suggested? Memory is quite often the cause of BSOD's and as the mindumps are all different that adds to the evidence.

Two of the minidumps suggest hardware, unfortunately the log does not tell you which item of hardware is to blame. The crash with code A in these dumps is one that states hardware so it could well be the memory,

Check that you have the correct voltage set in the Bios for the new RAM.

Any overclocking on the CPU should be stopped.

Download this to keep a check on your CPU temperature http://www.alcpu.com/CoreTemp/

Make sure all your drivers are up to date.

Run the diagnostics on your hard drive as follows.