Look for a non-destructive partitioning program. Partition Magic is one that I have used in the past with great success. I haven't used one in quite some time, so there may be better or free ones out there.
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Test machine:
Vista Home Premium / Toshiba Satelitte X205 / 2.0GHz Core2 Duo / 2GB memory / 2x NVIDIA GeForce 8600M GT
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