unhandled exception: OutOfMemoryException

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I write a program handle a large amount of data,
it run smooth on develop computer, but not on other
client/test computer, even the test computer has much
more resource, any setting i should concern?

develop pc: athlon 2800+, 1G physical memory, 2G Virtual memory, install
visual studio
test pc: core 2 duo e4500, 2G physical memory, 2G Virtual memory, fresh
install, only hardware driver and windows update

develop pc show that i use about max 1.5g between running to end
test pc, show "unhandled exception: OutOfMemoryException" and max use 1.7g
of memory

what should i do/install/set to avoid the problem?





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