There's numerous crash dumps and all seem to involve your memory.
I'd suggest that the first place to start would be with a memory test. Here's some instructions on how to run it: Memory Diagnostics
Here's a summary of the crash dumps that you attached:
Code:
Built by: 7600.16385.amd64fre.win7_rtm.090713-1255
Debug session time: Sun Oct 11 20:42:48.827 2009 (GMT-4)
System Uptime: 0 days 0:03:06.435
BugCheck 1E, {ffffffffc0000005, fffff80002d5cd9c, 0, ffffffffffffffff}
Probably caused by : memory_corruption ( nt!MiApplyCompressedFixups+40 )
DEFAULT_BUCKET_ID: VISTA_DRIVER_FAULT
PROCESS_NAME: msmoney.exe
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Built by: 7600.16385.amd64fre.win7_rtm.090713-1255
Debug session time: Sun Oct 11 20:38:48.783 2009 (GMT-4)
System Uptime: 0 days 0:18:33.765
BugCheck 3B, {c0000005, fffff80002bba90d, fffff8800b813960, 0}
Probably caused by : ntkrnlmp.exe ( nt!ExAllocatePoolWithTag+53d )
DEFAULT_BUCKET_ID: VISTA_DRIVER_FAULT
PROCESS_NAME: TrustedInstall
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Built by: 7600.16385.amd64fre.win7_rtm.090713-1255
Debug session time: Tue Oct 13 19:16:02.407 2009 (GMT-4)
System Uptime: 0 days 1:17:54.140
BugCheck 4E, {99, 66598, 0, 750d8}
Probably caused by : memory_corruption ( nt!MiBadShareCount+4c )
DEFAULT_BUCKET_ID: VISTA_DRIVER_FAULT
PROCESS_NAME: WLXPGSS.SCR
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Built by: 7600.16385.amd64fre.win7_rtm.090713-1255
Debug session time: Tue Oct 13 15:16:50.049 2009 (GMT-4)
System Uptime: 0 days 20:45:40.125
BugCheck 1A, {41284, fffff900c5e14001, 325d, fffff90000812000}
Probably caused by : win32k.sys ( win32k!FreeObject+58 )
DEFAULT_BUCKET_ID: VISTA_DRIVER_FAULT
PROCESS_NAME: sidebar.exe
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Built by: 7600.16385.amd64fre.win7_rtm.090713-1255
Debug session time: Tue Oct 13 23:14:42.710 2009 (GMT-4)
System Uptime: 0 days 2:28:01.442
BugCheck 4E, {99, 13447e, 0, c1e3e}
Probably caused by : memory_corruption ( nt!MiBadShareCount+4c )
DEFAULT_BUCKET_ID: VISTA_DRIVER_FAULT
PROCESS_NAME: WLXPGSS.SCR