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How much RAM do you have available? Without any additional information, I would guess that the file size is larger than you have RAM to handle it.
How large is the file?
(If using Windows XP means you only have 2 gb RAM (or maybe even less?), which restricts you to only working in smaller files, maybe that would be a good argument for your business to upgrade?)
Does this happen with a new blank document? Or only in existing files?
Does it crash when you are using some particular tool? Or it crashes randomly?
If you can give us any other clues -- anything you might notice right before it crashes, it would help us find the problem.