All your last dumpfiles point to networkrelated bsod, traces of Netio.sys, Tcpip, Steam.exe, chrome.exe etc.
You have many drivers installed which predates windows 8.1., including your wireless, lan, bluetooth drivers. It is known that many network devices with windows 7/8driver have problems with windows 8.1
You have a Intel(R) Ethernet Connection I217-V with drivers from march 2013. Please updatethis to the latest windows 8.1 compatible drivers, also update yourwireless/bluetooth drivers.
You have asrock z87e-itx mainboard please update the drivers from the supportpage from here ASRock > Z87E-ITX
Advice: please also check/update all your other drivers/utilities etc. from the above page.