Macbook keeps randomly restarting...Mid 2010 model

Please help. My Mid 2010 15" Macbook pro keeps rebooting randomly without warning. I I get the following message.

Can anyone give me some ideas....

Interval Since Last Panic Report: 98538 sec

Panics Since Last Report: 3

Anonymous UUID: F3077460-475A-607E-E328-BA673F733A71

Tue Jan 22 08:23:20 2013

panic(cpu 0 caller 0xffffff7f91b6bb25): NVRM[0/1:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xd2000000 0xffffff80b09a3000 0x0a5480a2, D0, P2/4

Backtrace (CPU 0), Frame : Return Address

0xffffff801929af80 : 0xffffff801141d626

0xffffff801929aff0 : 0xffffff7f91b6bb25

0xffffff801929b080 : 0xffffff7f91c654b3

0xffffff801929b0e0 : 0xffffff7f91c65527

0xffffff801929b150 : 0xffffff7f91f7a853

0xffffff801929b290 : 0xffffff7f91c8b659

0xffffff801929b2c0 : 0xffffff7f91b758da

0xffffff801929b370 : 0xffffff7f91b70fac

0xffffff801929b560 : 0xffffff7f91b721d8

0xffffff801929b630 : 0xffffff7f92bda45e

0xffffff801929b6f0 : 0xffffff7f92c0b00f

0xffffff801929b770 : 0xffffff7f92befb4a

0xffffff801929b7d0 : 0xffffff7f92bf0415

0xffffff801929b820 : 0xffffff7f92bf080f

0xffffff801929b8c0 : 0xffffff7f92bf1239

0xffffff801929b900 : 0xffffff7f92bace81

0xffffff801929ba80 : 0xffffff7f92bed7fe

0xffffff801929bb40 : 0xffffff7f92bab98a

0xffffff801929bba0 : 0xffffff8011865bc9

0xffffff801929bbc0 : 0xffffff8011867170

0xffffff801929bc20 : 0xffffff8011864b8f

0xffffff801929bd70 : 0xffffff80114981e1

0xffffff801929be80 : 0xffffff8011420aed

0xffffff801929beb0 : 0xffffff8011410448

0xffffff801929bf00 : 0xffffff801141961b

0xffffff801929bf70 : 0xffffff80114a5b16

0xffffff801929bfb0 : 0xffffff80114ced53

Kernel Extensions in backtrace:

com.apple.NVDAResman(8.0)[A4C53A36-22B6-3075-82B9-9DE612A9C015]@0xffffff7f91b04 000->0xffffff7f91e06fff

dependency: com.apple.iokit.IOPCIFamily(2.7.2)[B1B77B26-7984-302F-BA8E-544DD3D75E73]@0xffff ff7f91a72000

dependency: com.apple.iokit.IONDRVSupport(2.3.5)[86DDB71C-A73A-3EBE-AC44-0BC9A38B9A44]@0xff ffff7f91af0000

dependency: com.apple.iokit.IOGraphics

Model: MacBookPro6,2, BootROM MBP61.0057.B0F, 2 processors, Intel Core i5, 2.4 GHz, 4 GB, SMC 1.58f16

Graphics: Intel HD Graphics, Intel HD Graphics, Built-In, 288 MB

Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 256 MB

Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54313235533642465238432D47372020

Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54313235533642465238432D47372020

AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.106.98.81.22)

Bluetooth: Version 4.0.9f33 10885, 2 service, 18 devices, 1 incoming serial ports

Network Service: Ethernet, Ethernet, en0

Serial ATA Device: Hitachi HTS545032B9SA02, 320.07 GB

Serial ATA Device: MATSHITADVD-R UJ-898

USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfa100000 / 2

USB Device: BRCM2070 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 5

USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8218, 0xfa113000 / 8

USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfa130000 / 4

USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0236, 0xfa120000 / 3

USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfd100000 / 2

USB Device: My Passport 0740, 0x1058 (Western Digital Technologies, Inc.), 0x0740, 0xfd130000 / 5

USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 4

USB Device: Built-in iSight, apple_vendor_id, 0x8507, 0xfd110000 / 3