Process_Has_Locked_Pages and stdriver64.sys BSOD

I randomly get two different bsod. Usually they occur when I wake my computer up (or before it wakes up), and sometimes they occur in the middle of doing something.
I've made sure all my hardware is installed properly and I think all my drivers are up to date. I've reinstalled the realtek audio device as that's related to the stdriver64.sys crashes, but I still get them. This has been going on for a while now, maybe once every week or two but they have gotten more frequent lately.


System specs:
Windows 7 Home Premium 64x SP1 Full Retail
Intel E5400
4GB DDR2 Ram
MSI G41M4
ATI Radeon 4600 1GB
Dell 1504FP (1024x768@60Hz)
VA26LHDTV10T (1776x1000@60Hz)
750GB HDD
Hardware and OS are ~1 year old

Thanks for your help. Does this cover the locked_pages problem too? I don't think soundtap is installed on my system but I did find another nch program and have removed that. I'll post again if I have any other problems.

Hey,
I woke up my computer this morning and was faced with the same stdriver64.sys crash