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I recommend a program called BootIt Next Generation. Found here http://www.terabyteunlimited.com/bootitng.html

I used it to partition my hd to get ready for linux and had no troubles at all.
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In Windows XP (maybe others too, not sure) to enable or disable sharing you have to right click on the drive that you don't want to be shared and click the sharing tab to disable or enable sharing.
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