Windows 7: BSOD when computer autolocks, error 1000007e

Hi, I purchased an HP dvt6-7000 laptop about a month ago - Windows home premium 64 bit. Am using it for work, but recently it's started crashing whenever I leave the computer and it auto-locks. I tried disabling sleep but it still crashes. I called HP support and they had me test the memory and hard drive in Bios, and update the BIOS, but it still crashed.

I've attached the dump files, and also copied and pasted the error code below.


Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033



Additional information about the problem:
BCCode: 1000007e
BCP1: FFFFFFFFC0000005
BCP2: FFFFF880076F0D12
BCP3: FFFFF8800B41ABE8
BCP4: FFFFF8800B41A440
OS Version: 6_1_7601
Service Pack: 1_0
Product: 768_1

The dumps point to dlkmd.sys, a driver associated with 'WDDM KMD Loader - DisplayLink Core Software'. From the below link, please download the latest version of the program. If the crashes continue, uninstall the program.
DisplayLink: Windows Software

updated the driver last night and let it go to sleep again. so far so good! thank you very much.

Great, hopefully you won't get any more crashes!