How to safely migrate from centOS to fedora 10

[kmadananteshwar.vbhat at gmail.com]

Hey folks I am a centOS user who's been running fedora off a live DVD for the past 4 months and am beginning to want to migrate to fedora and would like to know how exactly do I migrate to fedora safely without messing around with my windows vista installation coz I need vista because I use it at work and would be in deep trouble if I screwed up the master boot record of vista and also coz I have a lot of important data on the windows partition 
Yours, 
KMB 
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