If it is only happening during gaming or situations when the CPU is under stress I would suspect overheating.
If it is an installed card rather than an onboard one, I would try changing slots. If it is an integrated card, you probably need something a little more game worthy and should buy something to install. If you have both an integrated and an installed card -- make sure the integrated one is disabled in the BIOS.
Did you update the Sound Card drivers from the System Vendor's, motherboard vendor's site or elsewhere?
This is a general wassup for 7E errors >>
http://msdn.microsoft.com/en-gb/library/ms795746.aspx
Also, you might as well upload the minidumps -- the 7E errors may show a driver as well >>
I can run a debugging utility on the dump files if you do this:
1 > create a new folder on the desktop and call it "dumpcheck" or whatever you like
2 > navigate to
c:\windows\minidump and copy the last few minidump files to that folder. *this assumes 'c' is your boot drive, if it is not, subsitute accordingly
3 > close the folder and right click on it and select
Send to Compressed (zipped) Folder.
4 > use the "manage attachments" in the "advanced" reply window to upload that zip file here as an attachment.
This might point us to a non Microsoft driver causing the error, if one exists for it.
Since almost all bugchecks can be caused by faulty ram, I would recommend you perform memory tests.
Beginners Guides: Diagnosing Bad Memory Memtest86 - A Stand-alone Memory Diagnostic