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I have 3 things I would like to mention
1. Make sure that you visit Windows Update to install updates, it looks like you haven't installed any update but that shouldn't be possible after 3 months.
2. Update your BIOS
3. Update your network drivers, they seem to be causing a lot of crashes though I'm not sure about all of them as it would take too much time to analyze everything properly.
Visit Z87-K | Motherboards | ASUS Global
and install the newest BIOS update and update the network LAN drivers.
2: kd> lmvm au630x64
Browse full module list
start end module name
fffff800`b0080000 fffff800`b0144000 au630x64 T (no symbols)
Loaded symbol image file: au630x64.sys
Image path: \SystemRoot\system32\DRIVERS\au630x64.sys
Image name: au630x64.sys
Browse all global symbols functions data
Timestamp: Thu Mar 14 10:44:07 2013 (51419BE7)
Translations: 0000.04b0 0000.04e4 0409.04b0 0409.04e4