If this is a graphics related crash, this thread will add some more information in my knowledge
Earlier I have never noticed a stop 0xF4 caused by graphics. So it makes me highly interested.
Edit: just noticed .... you need to install Service Pack 1.
Learn how to install Windows 7 Service Pack 1 (SP1)
Service Pack Center - Microsoft Windows
Edit again: You said it is a custom built, right? and the system says ....
BiosVendor = American Megatrends Inc.
BiosVersion = P1.60
BiosReleaseDate = 12/06/2012
SystemManufacturer = To Be Filled By O.E.M.
SystemProductName = To Be Filled By O.E.M.
SystemFamily = To Be Filled By O.E.M.
SystemVersion = To Be Filled By O.E.M.
SystemSKU = To Be Filled By O.E.M.
BaseBoardManufacturer = ASRock
BaseBoardProduct = Z77 Pro4
Explain it please?