BSOD after upgrade to windows 64bit and additional RAM

Hi, I upgraded my computer from Windows 32bit to Windows 64 bit. I also installed 8GB additional RAM (a total of 12GB). Since then if the computer is idle for a bit then I get a BSOD with the following errors,

A problem has been detected and Windows has been shut down to prevent damage
to your computer.

The problem seems to be caused by the following file: ntoskrnl.exe


If this is the first time you've seen this stop error screen,
restart your computer. If this screen appears again, follow
these steps:

Check to make sure any new hardware or software is properly installed.
If this is a new installation, ask your hardware or software manufacturer
for any Windows updates you might need.

If problems continue, disable or remove any newly installed hardware
or software. Disable BIOS memory options such as caching or shadowing.
If you need to use safe mode to remove or disable components, restart
your computer, press F8 to select Advanced Startup Options, and then
select Safe Mode.

Technical Information:

*** STOP: 0x0000000a (0xfffffa802bee8180, 0x0000000000000002, 0x0000000000000001,

*** ntoskrnl.exe - Address 0xfffff80002ad9c40 base at 0xfffff80002a5d000 DateStamp


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