BSOD - Windows 7 x64 nvlddmkm.sys + dxgkrnl.sys + dxgmms1.sys

I've been having the same problems, and just as I was writing this post originally another BSOD:
IRQL_NOT_LESS_OR_EQUAL

I've also had:
DRIVER_IRQL_NOT_LESS_OR_EQUAL
PAGE_FAULT_IN_NON_PAGED_AREA

But the most frequent are related to IRQL and DRIVER_IRQL
and the same as in the title of post - well one I remember frequently:
dxgkrnl.sys

This seemed to start when I added a DDR3 Kingston 4gb 1333ghz RAM to my-:
HP G6-1016TU Windows 7 x64

it comes with a 4gb 1333ghz SAMSUNG (Samsung supply this model of HP obviously) - at first I thought it was because I was mixing the brands, then I read so many posts that this should not matter at all aslong as you are using the correct Ghz and Slot.

One thing I noticed was that CPU-z said slot 1 (samsung) and Slot2 (kingston) were both running great but at 667ghz....

Could these problems have something to do with overloading the Ghz in the 2 slots. eg. I should put 2 x 667ghz DDR3's in instead of 2 x 1333ghz - I mean I was only following what the specs told me the correct RAM frequency and slot type to use was, and Kingston being a top brand I bought a 4gb and 2 x 2gb DDR3 1333ghz to upgrade my 2 2011 Notebook Systems. (only the HP has been upgraded so far.)

Since the last post and considering I had 5 BSODS since being online 2hrs (the worst in 2wks since I installed the RAM), I thought it was time to to some experimenting.

I took out the Kingston and no BSOD's in 30mins, I should have had one by now as I am repeating what I was doing over and over again, although the messages varied in each BSOD, the last 5 doing with the IRQL and PAGES listed above, but not the usual dxgkrnl.sys came up these last 5 times, then again it has been increasing from 1 per 3 days, 1 per 2 days, to one per day, then 2 per day, 3 and 5 even in one day has been the most tonight in 2hrs....

DriveSweeper is not available anymore, what is the purpose of this, to find out-dated drivers and upgrade them?

can you recommend another free of commercial one to use please. As I won't let upgrading RAM beat me on this, I have been upgrading notebooks and PC's for years and never had a problem with mixing brands, so I ruled that out, and went with the 1333ghz x 2 being dropped back to 667ghz x 2 having something to do with it, although the mention of IRQL DRIVER in the same error makes me want to make sure all drivers are up-to-date, and DirectX is way up-to-date since last update was 2011 on MS's site.

I've also downloaded the other app and will burn to CD and run it when I goto bed with the Kingston back in, but this time I will replace the Samsung with a 2gb Kingston 1333ghz and see how that goes.

If you have any insight on what could be causing this I would be very greatful.

I deleted everything other than today's minidumps as I did a System clean thinking it may fix something, but if they will help, I will upload them. I will put the kingston back in if I get no errors in 24hrs, and then I should have some fresh dumps for you with the range of errors I've been getting...

ALSO - I do not play games, I do watch VLC Player, though not today, and I can't remember getting a BSOD while watching a Show or Movie etc. I'd remember that.
I have the Intel 3000 inbuilt video card that all HP G6 mid-range notebook models around the age of mine (early 2011 1st gen ivy bridge) and Core i5 2400M

Thanks in advance for ANY help or programs you can turn me onto for upgrading and finding errors within my drivers also. I did notice a diamond with a ! inside next to the VIRTUAL DISK BUS ENUMERATOR in the Device Manager section. (If you could tell instruct me how to fix this, It says driver is upto date.).

Thanks again and sorry for taking up you're time - I just hope other's learn from my errors, as reading the web there are LOTS of the same, but no solutions that fix everyone's. (like mine).

Regards,
@jaycameron