IMac (2007, Intel Duo-Core, 2Ghz, 4GB Ram) crashing unexpectedly

Need some help. I know my iMac is getting on in years, but this is becoming a problem. We have been saving up for a new computer, but in the mean time I'd like make this one last. I have combed the forums and I'm not reading any solutions that seem to help this problem. I am having unexpected crashes occur seemingly during loaded work, although normal. For example, I was running iTunes, Adobe Lightroom, Mail, and Safari. Normal temperatures, so its not overheating. This has been an off and on issue for several months now. I have run AHT, and checked the disks for repairs. I do have third party memory, but I have re-installed them to check they are properly seated.
Here is the readout from Console:
12/7/11 12:06:54 PM          DirectoryService[11]          Improper shutdown detected
12/7/11 12:07:07 PM          mDNSResponder[18]          mDNSResponder mDNSResponder-258.21 (May 26 2011 14:40:13) starting
12/7/11 12:07:07 PM          com.apple.SecurityServer[24]          Session 0x5fbff962 created
12/7/11 12:07:08 PM          kernel          AirPort: Link Down on en1. Reason 8 (Disassociated because station leaving).
12/7/11 12:07:08 PM          kernel          Initializing
12/7/11 12:07:08 PM          kernel          Probing
12/7/11 12:07:08 PM          kernel          Starting2
12/7/11 12:07:08 PM          kernel          getHardwareAddress
12/7/11 12:07:08 PM          kernel          Previous Shutdown Cause: 0
What is shutdown cause: 0??
Would like any insight you can offer...

Thank you den.thed!
I have a kingston 2GB module sitting in my cart at Newegg... It is the "regular" one not the ValueRAM version. I had come across a thread somewhere on these forums that also warned against "Value RAM" modules, but I did not know about multi-speed issues...Good to know!
Thanks again!!
Vic
Edited to add- I went back to zoom in on the product image at Newegg to make sure it was the right one and once it's blown up, you can clearly see " Apple Macbook Pro and iMac Intel series".
First time I've seen it on the package, it is usually either one or the other.
Well, Thanks again!
Message was edited by: theycallmemcgyver

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IMac (2007, Intel Duo-Core, 2Ghz, 4GB Ram) crashing unexpectedly

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