Computer hanging all the time

I have one Lion machine, an Intel iMac circa 2009, and it keeps hanging on me.  Seems to be related to file system browsing from within apps, at least.  Like, exporting a quicktime file from Quicktime Player 7, or within Xcode.  Often the Finder will hang and I have to force quit, but the Finder relaunch may not work, and then I have to kill the power.
I dont' know if this machine's drive is going bad or what.  Anyone else having this trouble?
Thanks
Bob

This looks suspiciously like your computer may be having RAM issues.
If you've recently added memory to your system, try removing it and see if the errors persist.
If not, try running the RAM tests located in the diagnostics on the Software Restore disc that originally came with your Mac.

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