MS Excel 2010 Randomly Closes/Crashes

I've got a user who does a lot of work in Excel 2010. She'll often have several spreadsheets open. Lately, Excel has been closing randomly. There's no error message- the program just closes, discarding all unsaved work.

I've reinstalled Office 2010 and I've run updates on both Windows and Office. No dice. I've searched the windows event logs and found nothing. Any ideas on how to troubleshoot this?

The computer in question is an HP dc7700 running Windows XP Pro (SP3), Intel(R) Core(TM)2 CPU with 3GB of RAM.

Thanks.

[Edit]

I should probably add that I've also acquired one of these spreadsheets and opened several instances of it on my own machine. I was unable to reproduce the problem.
urs_misAsked:
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Jackie ManCommented:
In the user's machine, install and run Process Monitor to identify the clause for excel closing.

http://technet.microsoft.com/en-us/sysinternals/bb896645
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urs_misAuthor Commented:
Thank you, I'm trying that and will post once I can get some results.
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