Sudden shut down problem in my new imac

I bought intel based 24" imac two week age from apple store website.
Once in a day, the mac suddenly stops and shows a massage "forced shutdown and restart the mac." Just ten minute before, I lost my five-hour-work. How can I this recurring problem? Should I reinstall OS X again? Or is that a hardware problem? I don't have bootcamp, or illegal software. Only printer and keyboard are attached to USB slot, No firewall connection. And factory installed two-giga ram.

Thank you for your help. There is no out-of-factory addition of ram, and Apple hardware test said no errors. Here is the panic log of my imac. As you see, my mac have a big problem. Do you have any idea about this panic log?
Description: Panic (system crashes) log
Size: 14.14 KB
Last Modified: 11/15/06 2:19 AM
Location: /Library/Logs/panic.log
Recent Contents: ...
0x25853be8 : 0x7f1c07 (0x456f004 0x45a0e04 0x25853cd0 0x25853cd0)
0x25853cf8 : 0x7f19d5 (0x456f004 0x45a4c04 0x1 0xd)
0x25853d48 : 0x93c141 (0x456f004 0x45a4c04 0xd 0x9c7920)
0x25853e28 : 0x983294 (0x456f004 0x45a0e04 0x0 0x70b7a7)
0x25853ee8 : 0x7e89d0 (0x456f004 0x4541404 0x0 0x456f004)
0x25853f38 : 0x6d24c2 (0x456f004 0x4541404 0x0 0x1a1ec0)
0x25853f78 : 0x13d7d2 (0x4491c00 0x23fa7004 0x25853fc8 0x3979ac)
0x25853fc8 : 0x19a74c (0x0 0x0 0x10 0x4909340) Backtrace terminated-invalid frame pointer 0x0
Kernel loadable modules in backtrace (with dependencies):
com.apple.nvidia.nv40hal(4.4.0)@0x8f6000
dependency: com.apple.iokit.IOPCIFamily(2.1)@0x5b3000
dependency: com.apple.NVDAResman(4.4.0)@0x6c1000
com.apple.NVDAResman(4.4.0)@0x6c1000
dependency: com.apple.iokit.IOPCIFamily(2.1)@0x5b3000
dependency: com.apple.iokit.IOGraphicsFamily(1.4.4)@0x697000
dependency: com.apple.iokit.IONDRVSupport(1.4.4)@0x6b2000
Kernel version:
Darwin Kernel Version 8.8.1: Mon Sep 25 19:42:00 PDT 2006; root:xnu-792.13.8.obj~1/RELEASE_I386
Mon Nov 13 20:48:35 2006
panic(cpu 1 caller 0x001A3135): Unresolved kernel trap (CPU 1, Type 14=page fault), registers:
CR0: 0x80010033, CR2: 0x00000000, CR3: 0x01116000, CR4: 0x000006e0
EAX: 0x00000000, EBX: 0x00001000, ECX: 0x042d8400, EDX: 0x042d8400
CR2: 0x00000000, EBP: 0x0445ba00, ESI: 0x00384122, EDI: 0x00000057
EFL: 0x00010206, EIP: 0x0057b1e9, CS: 0x00000008, DS: 0x00000010
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x258ebad8 : 0x128d1f (0x3c9540 0x258ebafc 0x131df4 0x0)
0x258ebb18 : 0x1a3135 (0x3cf1f4 0x1 0xe 0x3cea24)
0x258ebc28 : 0x19a8d4 (0x258ebc40 0x0 0x258ebc58 0x3bc325) Backtrace terminated-invalid frame pointer 0x445ba00
Kernel version:
Darwin Kernel Version 8.8.1: Mon Sep 25 19:42:00 PDT 2006; root:xnu-792.13.8.obj~1/RELEASE_I386
Mon Nov 13 22:51:49 2006
panic(cpu 1 caller 0x001A3135): Unresolved kernel trap (CPU 1, Type 14=page fault), registers:
CR0: 0x80010033, CR2: 0x4d8b0c4b, CR3: 0x01116000, CR4: 0x000006e0
EAX: 0x00000000, EBX: 0x0383e230, ECX: 0x00000000, EDX: 0x0b485000
CR2: 0x4d8b0c4b, EBP: 0x2572bf48, ESI: 0x00033a23, EDI: 0x03ecc360
EFL: 0x00010046, EIP: 0x00194552, CS: 0x00000008, DS: 0x00030010
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x2572bbf8 : 0x128d1f (0x3c9540 0x2572bc1c 0x131df4 0x0)
0x2572bc38 : 0x1a3135 (0x3cf1f4 0x1 0xe 0x3cea24)
0x2572bd48 : 0x19a8d4 (0x2572bd60 0xee6b280 0x0 0x27c62d0)
0x2572bf48 : 0x1a33a8 (0x1a9c0c8 0xb485000 0x0 0x3)
0x2572bfc8 : 0x19a804 (0x3edb920 0x0 0x19d0b5 0x4847160) No mapping exists for frame pointer
Backtrace terminated-invalid frame pointer 0xbffedf28
Kernel version:
Darwin Kernel Version 8.8.1: Mon Sep 25 19:42:00 PDT 2006; root:xnu-792.13.8.obj~1/RELEASE_I386
Tue Nov 14 08:01:39 2006
panic(cpu 1 caller 0x0019A096): interlock timeout for mutex 0x3f255e0
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x25773e98 : 0x128d1f (0x3c9540 0x25773ebc 0x131df4 0x0)
0x25773ed8 : 0x19a096 (0x3ce3d4 0x3f255e0 0x0 0x48ffe28)
0x25773f08 : 0x1979c7 (0x3f255e0 0x216 0x25773f38 0x37ec39)
0x25773f18 : 0x37ec39 (0x3f255e0 0x3ed0f5c 0x25773f58 0x135688)
0x25773f38 : 0x525059 (0x3f2a510 0x4ae820 0x25773fc8 0x4ae820)
0x25773f58 : 0x397bbf (0x3fe1a00 0x135ec3 0x0 0x3ec76c8)
0x25773f88 : 0x397927 (0x3fe1a00 0x0 0x450 0x1203)
0x25773fc8 : 0x19a74c (0x3fe1a00 0x0 0x19d0b5 0x4471fc0) Backtrace terminated-invalid frame pointer 0x0
Kernel loadable modules in backtrace (with dependencies):
com.apple.iokit.IOUSBFamily(2.6.1)@0x515000
Kernel version:
Darwin Kernel Version 8.8.1: Mon Sep 25 19:42:00 PDT 2006; root:xnu-792.13.8.obj~
Wed Nov 15 02:19:51 2006
panic(cpu 0 caller 0x001C1A67): buffer has UPL, but not marked BUSY: 3736c4a0
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x257bb458 : 0x128d1f (0x3c9540 0x257bb47c 0x131df4 0x0)
0x257bb498 : 0x1c1a67 (0x3d11dc 0x3736c4a0 0x257bb4d8 0x2)
0x257bb528 : 0x1c1fdc (0x40c3e70 0x732 0x0 0x2000)
0x257bb568 : 0x1c2237 (0x2000 0x0 0x0 0x10)
0x257bb588 : 0x2eb0ba (0x40c3e70 0x732 0x0 0x2000)
0x257bb5f8 : 0x3148b7 (0x40c3e70 0x732 0x0 0x257bb65c)
0x257bb618 : 0x315642 (0x4102b84 0x732 0x257bb65c 0x257bb678)
0x257bb698 : 0x313158 (0x4102b84 0x4133020 0x257bb6c4 0x257bb760)
0x257bb788 : 0x2ef22b (0x410fee0 0x4133004 0x257bb8dc 0x257bb8ee)
0x257bb908 : 0x2f086a (0x0 0x257bbaa4 0x257bb9dc 0x257bba38)
0x257bb978 : 0x2f808c (0x4050804 0x257bba90 0x0 0x257bbaa4)
0x257bbad8 : 0x1e2df1 (0x257bbaf8 0x257bbf18 0x1 0x0)
0x257bbb28 : 0x1cab0b (0x4175ef4 0x257bbddc 0x257bbef0 0x257bbf18)
0x257bbb98 : 0x1cb331 (0x257bbdc4 0x100 0x257bbde4 0x0)
0x257bbc48 : 0x1d7040 (0x257bbdc4 0x41ace00 0x1d000 0x3d000)
0x257bbd78 : 0x1d732c (0xbffff7bc 0x0 0x0 0x0) Backtrace continues...
Kernel version:
Darwin Kernel Version 8.8.1: Mon Sep 25 19:42:00 PDT 2006; root:xnu-792.13.8.obj~1/RELEASE_I386

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