Q: System crashes

My Imac started crashing a few weeks ago.  Sometimes upon reboot, it will give 3 short beeps and what seems like a long beep.  A panic report is below.  Any ideas?  Wondering if it was memory - Any one know how to read this...

Interval Since Last Panic Report:  3111709 sec

Panics Since Last Report:          2

Anonymous UUID:                    CCA0D49E-DB75-BC80-2A5A-2D0B382C3537

Sun Mar  3 13:27:45 2013

panic(cpu 0 caller 0xffffff80138b7bd5): Kernel trap at 0xffffff801382da10, type 13=general protection, registers:

CR0: 0x000000008001003b, CR2: 0xffffff80f5465000, CR3: 0x000000001641e000, CR4: 0x0000000000000660

RAX: 0x0000000000000001, RBX: 0xffffff8025cf6aa0, RCX: 0x0000000009000000, RDX: 0xffffff80ef406078

RSP: 0xffffff80fac3be50, RBP: 0xffffff80fac3be80, RSI: 0xffffff80ef406068, RDI: 0x0000000000000000

R8:  0xffffff8013ebec60, R9:  0xffffffffffffffff, R10: 0x00000000ffffffff, R11: 0x00000000ffffff80

R12: 0xffffff80f5455000, R13: 0xffffff8025cf3580, R14: 0x01ffff8025cf3550, R15: 0x0000000000000000

RFL: 0x0000000000010002, RIP: 0xffffff801382da10, CS:  0x0000000000000008, SS:  0x0000000000000000

Fault CR2: 0xffffff80f5465000, Error code: 0x0000000000000000, Fault CPU: 0x0

Backtrace (CPU 0), Frame : Return Address

0xffffff80fac3baf0 : 0xffffff801381d626

0xffffff80fac3bb60 : 0xffffff80138b7bd5

0xffffff80fac3bd30 : 0xffffff80138ce4ed

0xffffff80fac3bd50 : 0xffffff801382da10

0xffffff80fac3be80 : 0xffffff8013c2e1e9

0xffffff80fac3bec0 : 0xffffff8013c2ca47

0xffffff80fac3bf30 : 0xffffff8013c2d3a2

0xffffff80fac3bf70 : 0xffffff8013c31e99

0xffffff80fac3bfb0 : 0xffffff80138b26b7

BSD process name corresponding to current thread: kernel_task

Mac OS version:

Not yet set

Kernel version:

Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64

Kernel UUID: 69A5853F-375A-3EF4-9247-478FD0247333

Kernel slide:     0x0000000013600000

Kernel text base: 0xffffff8013800000

System model name: iMac10,1 (Mac-F2268CC8)

System uptime in nanoseconds: 1023282991

last loaded kext at 712880305: com.apple.driver.AirPort.Atheros40          600.70.23 (addr 0xffffff7f94cfb000, size 1531904)

loaded kexts:

com.apple.driver.AirPort.Atheros40          600.70.23

com.apple.driver.AppleFWOHCI          4.9.6

com.apple.driver.AppleAHCIPort          2.4.1

com.apple.driver.AppleUSBEHCI          5.4.0

com.apple.nvenet          2.0.19

com.apple.driver.AppleIntelCPUPowerManagementClient          196.0.0

com.apple.driver.AppleEFINVRAM          1.6.1

com.apple.driver.AppleUSBOHCI          5.2.5

com.apple.driver.AppleRTC          1.5

com.apple.driver.AppleHPET          1.7

com.apple.driver.AppleACPIButtons          1.6

com.apple.driver.AppleSMBIOS          1.9

com.apple.driver.AppleACPIEC          1.6

com.apple.driver.AppleAPIC          1.6

com.apple.nke.applicationfirewall          4.0.39

com.apple.security.quarantine          2

com.apple.driver.AppleIntelCPUPowerManagement          196.0.0

com.apple.iokit.IO80211Family          500.15

com.apple.iokit.IOFireWireFamily          4.5.5

com.apple.iokit.IOAHCIFamily          2.2.1

com.apple.iokit.IONetworkingFamily          3.0

com.apple.driver.NVSMU          2.2.9

com.apple.iokit.IOUSBFamily          5.4.0

com.apple.driver.AppleEFIRuntime          1.6.1

com.apple.iokit.IOHIDFamily          1.8.0

com.apple.iokit.IOSMBusFamily          1.1

com.apple.security.sandbox          220

com.apple.kext.AppleMatch          1.0.0d1

com.apple.security.TMSafetyNet          7

com.apple.driver.DiskImages          344

com.apple.iokit.IOStorageFamily          1.8

com.apple.driver.AppleKeyStore          28.21

com.apple.driver.AppleACPIPlatform          1.6

com.apple.iokit.IOPCIFamily          2.7.2

com.apple.iokit.IOACPIFamily          1.4

com.apple.kec.corecrypto          1.0