PLEASE, PLEASE PLEASE read this whole post before answering, as I've posted on other forums and gotten run-arounds and generic responses to do things I've already tried...
For the past couple of weeks I've been getting random blue-screens with either of the above codes, the 1000007e referencing atikmdag.sys, the 000007a just freezing up and not even creating a dump file. I've looked up dozens of help issues online, and tried a number of issues.
1) Being told that it was the driver, I completely uninstalled, used a program (the name escapes me but it was referenced on another post from this site) to completely wipe history of the video drivers from my system, reinstalled, and manually re-unpacked, again from the instructions on a post on this site. Still got crashes. Tried putting in the latest driver as well as rolling back to ATI's 13.25 drivers, crashed.
2) I was told it may have been an issue with the files or the hard drive, so I ran System File Checker and that fixed a bunch of corrupted things, and also ran both CHKDSK and standard Windows 7 scan disk, as well as Western Digital diagnostics. All came up fine, and it still happened.
3) I was told that it might be a memory issue, so I ran the latest Memtest overnight and it found nothing. Figured "Hey, let's be funny and say that it might be an issue with the sticks anyway", switched with my room-mate because we have the same rigs except for motherboard and hard drives, discovered one of my memory slots ACTUALLY WAS messed up, moved to slots 1/3 instead of 2/4. Still happened.
4) Was told that the "voltages" might be the problem, but also that MSI boards are notorious for not updating internal configurations when detection is set to Auto instead of manual; I cleared the CMOS memory and returned all the settings to factory default, then let it re-find. I haven't crashed YET, but this was only done last night, and the crashes have often been several days apart.
I'm at my wits' end, especially since with half the posts I see it's nothing but one person after another saying "I've done all these things that people say works and nothing has for me, even switching parts and reinstalling windows and changing settings and getting whole new cards" and everything else... I just hope to get SOME kind of help, or hope or assurance here.
Motherboard: MSI 970A-G46 AM3+ AMD 970 + SB950
CPU:AMD Phenom II X4 960T Zosma 3.0GHz HD96ZTWFGRBOX
GPU: SAPPHIRE DUAL-X 100365BF4L Radeon R9 270 2GB
Sound Card: ASUS Xonar DG
PSU:Rosewill Green Series RG630-S12 630W