Bluescreen when idle

Recently, I upgraded some of my hardware, the parts are listed here: . I did a clean install of Windows 7, but recently I've been having a problem when leaving my computer 30 mins or so. I get back, and on the screen there's a prompt saying "Windows has recovered from an unexpected shutdown". This is the details of it:
Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7600.
Locale ID: 1033

Additional information about the problem:
BCCode: 7a
BCP1: 0000000000000020
BCP4: 0000000000000000
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:

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I haven't had a blue screen during an active session, and I've been playing games for hours at a time. Any ideas as to what the problem is?
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More about bluescreen idle
  1. That bugcheck code is KERNEL_DATA_INPAGE_ERROR. It means the system was unable to read in a page from the pagefile into system memory. Parameter 2 is the status of the I/O operation that failed which is STATUS_DEVICE_NOT_CONNECTED in this case. From the failure status, it seems like a SATA controller or HDD issue. It could also be RAM-related. I also notice that you're not running SP1; you should definitely install the latest updates.
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