The dumps seem to blame your nVidia graphics drivers.
Try removing your current ones, in Programs and Features. Then install these ones: NVIDIA DRIVERS 258.96 WHQL
They are a bit newer than your current ones.
Test your GPU temps: SpeedFan - Access temperature sensor in your computer
Also, run Furmark: Video Card - Stress Test with Furmark
See if that helps.
...Summary of the Dumps:
Code:
Built by: 7600.16617.amd64fre.win7_gdr.100618-1621
Debug session time: Sat Oct 16 01:08:44.371 2010 (UTC - 4:00)
System Uptime: 0 days 3:27:51.792
BugCheck 50, {fffff88003df0000, 1, fffff88011e981ce, 0}
*** WARNING: Unable to verify timestamp for nvlddmkm.sys
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys
Probably caused by : nvlddmkm.sys ( nvlddmkm+751ce )
BUGCHECK_STR: 0x50
PROCESS_NAME: csrss.exe
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
Built by: 7600.16617.amd64fre.win7_gdr.100618-1621
Debug session time: Fri Oct 15 17:21:27.762 2010 (UTC - 4:00)
System Uptime: 0 days 4:27:03.432
BugCheck 50, {fffff88003b30000, 1, fffff88011e7d1ce, 0}
*** WARNING: Unable to verify timestamp for nvlddmkm.sys
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys
Probably caused by : nvlddmkm.sys ( nvlddmkm+751ce )
BUGCHECK_STR: 0x50
PROCESS_NAME: csrss.exe
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии