White Macbook 2009 Repeated Kernel Panic

My white 13-inch late-2009 Macbook started experiencing repeated kernel panics when I updated to Snow Leopard a couple of years ago. Since then, I have clean installed Mountain Lion, upgraded the HDD and upgraded the RAM to try to solve the issue. In spite of this, the occurrences of kernel panics have become increasingly common (I have experienced three panics within the past 4 hours).

I want to know if this is a software or kext issue that I can solve without spending money on another hardware fix. Below is the panic report of the most recent case. I'd really appreciate any help in interpreting the information. Thanks!

----START PANIC REPORT----

Interval Since Last Panic Report: 11847 sec

Panics Since Last Report: 2

Anonymous UUID: 3F23AF15-D846-4A46-952B-1CB763DD59F4

Tue Jun 11 08:04:27 2013

panic(cpu 0 caller 0xffffff80168a39bb): "pmap_page_protect() " "pmap=0xffffff8029a4ff00 pn=0x9239b vaddr=0x40a0c000\n"@/SourceCache/xnu/xnu-2050.24.15/osfmk/i386/pmap_x86_common. c:1183

Backtrace (CPU 0), Frame : Return Address

0xffffff808f003960 : 0xffffff801681d626

0xffffff808f0039d0 : 0xffffff80168a39bb

0xffffff808f003a60 : 0xffffff80168a53a6

0xffffff808f003a80 : 0xffffff8016864406

0xffffff808f003b70 : 0xffffff801686706c

0xffffff808f003c60 : 0xffffff801686b0e0

0xffffff808f003c90 : 0xffffff8016865bdf

0xffffff808f003cc0 : 0xffffff8016917554

0xffffff808f003cf0 : 0xffffff80169176b6

0xffffff808f003d10 : 0xffffff8016b108e3

0xffffff808f003d40 : 0xffffff8016b1450d

0xffffff808f003e40 : 0xffffff8016b1593d

0xffffff808f003eb0 : 0xffffff8016b18d5c

0xffffff808f003ee0 : 0xffffff8016911f3f

0xffffff808f003f10 : 0xffffff80168ffb81

0xffffff808f003f50 : 0xffffff8016be16aa

0xffffff808f003fb0 : 0xffffff80168ce9c3

BSD process name corresponding to current thread: mds

Mac OS version:

12E55

Kernel version:

Darwin Kernel Version 12.4.0: Wed May 1 17:57:12 PDT 2013; root:xnu-2050.24.15~1/RELEASE_X86_64

Kernel UUID: 896CB1E3-AB79-3DF1-B595-549DFFDF3D36

Kernel slide: 0x0000000016600000

Kernel text base: 0xffffff8016800000

System model name: MacBook6,1 (Mac-F22C8AC8)

System uptime in nanoseconds: 2040584859928

last loaded kext at 56768253117: com.parallels.kext.prl_vnic 7.0 15106.786747 (addr 0xffffff7f98a16000, size 20480)

last unloaded kext at 384509710512: com.apple.driver.AppleUSBTCKeyEventDriver 237.1 (addr 0xffffff7f9842f000, size 8192)

loaded kexts:

com.parallels.kext.prl_vnic 7.0 15106.786747

com.parallels.kext.prl_netbridge 7.0 15106.786747

com.parallels.kext.prl_hid_hook 7.0 15106.786747

com.parallels.kext.prl_hypervisor 7.0 15106.786747

com.parallels.kext.prl_usb_connect 7.0 15106.786747

com.apple.driver.AppleHWSensor 1.9.5d0

com.apple.driver.AudioAUUC 1.60

com.apple.driver.AGPM 100.12.87

com.apple.filesystems.autofs 3.0

com.apple.iokit.IOBluetoothSerialManager 4.1.4f2

com.apple.driver.AppleHDA 2.3.7fc4

com.apple.driver.AppleMikeyHIDDriver 122

com.apple.iokit.IOUserEthernet 1.0.0d1

com.apple.driver.AppleUpstreamUserClient 3.5.10

com.apple.driver.AppleMikeyDriver 2.3.7fc4

com.apple.Dont_Steal_Mac_OS_X 7.0.0

com.apple.driver.ApplePolicyControl 3.4.5

com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0

com.apple.driver.AppleLPC 1.6.0

com.apple.driver.AppleBacklight 170.2.5

com.apple.driver.AppleMCCSControl 1.1.11

com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport 4.1.4f2

com.apple.GeForce 8.1.2

com.apple.driver.SMCMotionSensor 3.0.3d1

com.apple.driver.AppleUSBTCButtons 237.1

com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1

com.apple.BootCache 34

com.apple.driver.AppleUSBTCKeyboard 237.1

com.apple.iokit.SCSITaskUserClient 3.5.5

com.apple.driver.XsanFilter 404

com.apple.iokit.IOAHCIBlockStorage 2.3.1

com.apple.driver.AppleAHCIPort 2.5.2

com.apple.nvenet 2.0.19

com.apple.driver.AirPort.Brcm4331 615.20.17

com.apple.driver.AppleUSBOHCI 5.2.5

com.apple.driver.AppleUSBHub 5.5.5

com.apple.driver.AppleUSBEHCI 5.5.0

com.apple.driver.AppleSmartBatteryManager 161.0.0

com.apple.driver.AppleEFINVRAM 1.7

com.apple.driver.AppleRTC 1.5

com.apple.driver.AppleHPET 1.8

com.apple.driver.AppleAC

Unable to gather system configuration information.Model: MacBook6,1, BootROM MB61.00C8.B00, 2 processors, Intel Core 2 Duo, 2.26 GHz, 4 GB, SMC 1.51f53

Graphics: NVIDIA GeForce 9400M, NVIDIA GeForce 9400M, PCI, 256 MB

Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1333 MHz, 0x0000, 0x563031443353463447423236383236383133

AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.106.98.100.17)

Bluetooth: Version 4.1.4f2 12041, 2 service, 11 devices, 1 incoming serial ports

Network Service: Wi-Fi, AirPort, en1

Serial ATA Device: Hitachi HTS545050A7E380, 500.11 GB

Serial ATA Device: MATSHITADVD-R UJ-898

USB Device: Built-in iSight, apple_vendor_id, 0x8507, 0x24400000 / 2

USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0236, 0x04600000 / 2

USB Device: BRCM2070 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x06100000 / 2

USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8218, 0x06130000 / 5

----END PANIC REPORT----