[Random crashes especially when gaming]

Recently, I also have been having problems with my new computer randomly crashing. Mostly I use my computer for gaming (in particular Starcraft 2 and League of Legends) so when it crashes, I'm generally in a game though not always (and it does still crash out of game). The BSOD crashes are getting worse, however, it doesn't always appear at all when a crash occurs. Looking through this thread gave me a few ideas, but I really don't know enough about computers to do much with the information.

Moderator note - Dxdiag indicated no problems - report not required.

And the BSOD crash information:==================================================
Dump File : 120110-11122-01.dmp
Crash Time : 12/1/2010 5:17:27 PM
Bug Check String : IRQL_NOT_LESS_OR_EQUAL
Bug Check Code : 0x0000000a
Parameter 1 : fffffa7f`ffff9fe0
Parameter 2 : 00000000`00000002
Parameter 3 : 00000000`00000001
Parameter 4 : fffff800`030cd349
Caused By Driver : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+70740
File Description : NT Kernel & System
Product Name : Microsoft® Windows® Operating System
Company : Microsoft Corporation
File Version : 6.1.7600.16617 (win7_gdr.100618-1621)
Processor : x64
Computer Name :
Full Path : C:\Windows\Minidump\120110-11122-01.dmp
Processors Count : 6
Major Version : 15
Minor Version : 7600
==================================================

==================================================
Dump File : 120110-17940-01.dmp
Crash Time : 12/1/2010 5:12:03 PM
Bug Check String : KMODE_EXCEPTION_NOT_HANDLED
Bug Check Code : 0x0000001e
Parameter 1 : ffffffff`c0000005
Parameter 2 : fffff880`04174084
Parameter 3 : 00000000`00000001
Parameter 4 : 00000000`000390bd
Caused By Driver : dxgmms1.sys
Caused By Address : dxgmms1.sys+38084
File Description :
Product Name :
Company :
File Version :
Processor : x64
Computer Name :
Full Path : C:\Windows\Minidump\120110-17940-01.dmp
Processors Count : 6
Major Version : 15
Minor Version : 7600
==================================================

==================================================
Dump File : 120110-9547-01.dmp
Crash Time : 12/1/2010 5:10:31 PM
Bug Check String : DRIVER_IRQL_NOT_LESS_OR_EQUAL
Bug Check Code : 0x000000d1
Parameter 1 : 00000000`0a01ff88
Parameter 2 : 00000000`00000002
Parameter 3 : 00000000`00000008
Parameter 4 : 00000000`0a01ff88
Caused By Driver : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+70740
File Description : NT Kernel & System
Product Name : Microsoft® Windows® Operating System
Company : Microsoft Corporation
File Version : 6.1.7600.16617 (win7_gdr.100618-1621)
Processor : x64
Computer Name :
Full Path : C:\Windows\Minidump\120110-9547-01.dmp
Processors Count : 6
Major Version : 15
Minor Version : 7600
==================================================

==================================================
Dump File : 112810-9562-01.dmp
Crash Time : 11/28/2010 6:08:47 PM
Bug Check String : IRQL_NOT_LESS_OR_EQUAL
Bug Check Code : 0x0000000a
Parameter 1 : 00000000`00000001
Parameter 2 : 00000000`00000002
Parameter 3 : 00000000`00000001
Parameter 4 : fffff800`0308bcdc
Caused By Driver : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+70740
File Description : NT Kernel & System
Product Name : Microsoft® Windows® Operating System
Company : Microsoft Corporation
File Version : 6.1.7600.16617 (win7_gdr.100618-1621)
Processor : x64
Computer Name :
Full Path : C:\Windows\Minidump\112810-9562-01.dmp
Processors Count : 6
Major Version : 15
Minor Version : 7600
==================================================

==================================================
Dump File : 112810-8814-01.dmp
Crash Time : 11/28/2010 4:36:29 PM
Bug Check String : NTFS_FILE_SYSTEM
Bug Check Code : 0x00000024
Parameter 1 : 00000000`001904fb
Parameter 2 : fffff880`0b5d9b68
Parameter 3 : fffff880`0b5d93d0
Parameter 4 : fffff880`0126a0fd
Caused By Driver :
Caused By Address :
File Description :
Product Name :
Company :
File Version :
Processor : x64
Computer Name :
Full Path : C:\Windows\Minidump\112810-8814-01.dmp
Processors Count : 6
Major Version : 15
Minor Version : 7600
==================================================


Microsoft's memory diagnostics didn't find a problem and I'm in the process of trying each single stick of ram at a time (4 sticks of 2 gigs of RAM). Thanks for any help anyone can give me and sorry for jumping into this help thread, but I didn't want to start a totally new thread.