Will upgrading to Lion fix an invalid node error?

Hi. We have an imac running OS10.4.11. It is still running, but freezes occasionally. I finally ran disk utility and found out we have invalid nodes. I have tried running fsck, rebooting from the original disks, doing an archive and reinstall,and running disk utility from the original disk. All fail due to errors. I do not own disk warrior. What I'm wondering is: do I buy DW to try to repair the original or would buying a new HD and purchasing Lion and installing that fix things up? I want the most parsimonious solution here. After all DW might not be able to solve the problem, the OS is pretty old now, I do not want to buy a new imac at this time, and the rest of the imac seems just fine and dandy. Thoughts?

Another vote for DW.
You must repair the HD, your best bet is likely DiskWarrior.
BTW, you might enjoy these DiskWarrior review/recommendations...
http://discussions.apple.com/thread.jspa?messageID=9645801&#9645801
http://discussions.apple.com/thread.jspa?messageID=10541019#10541019
http://discussions.apple.com/thread.jspa?messageID=11918925&#11918925
http://discussions.apple.com/thread.jspa?messageID=12684129#12684129
http://discussions.apple.com/thread.jspa?messageID=12744794&#12744794

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    htfromgrantown wrote:
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