If I install the Lion OS, do I have to reinstall my window in Bootcamp?

I am thinking to upgrade my mac to the Lion OS, but i've already installed window on my bootcamp side. If I upgrade the OS, do i have to reintall everything for my window side? Thanks

Technically you shouldn't, but there has been a few cases when it won't.
Drive parittion map issues, if there is data at the very bottom of the Windows partiton where the Lion Recovery HD will go etc.
If your Bootcamp isn't near full, I'd say your chances are good.
BUT always backup your data.
You can clone 10.6 using Carbon Copy Cloner to a blank external drive, it's option key hold bootable.
You can use Winclone to clone the Bootcamp parittion to another drive.
So you have options to come back to the warm safety of the snow kitty a lot faster than anyone else.
If you do decide to restore 10.6 to your internal drive, make sure to erase the ENTIRE internal drive before reverse cloning 10.6 back on.
Also you know 10.7 will not run your older Rosetta based programs/hardware drivers. Some are not ready yet.
http://roaringapps.com/apps:table
https://discussions.apple.com/docs/DOC-3045
https://discussions.apple.com/community/notebooks/macbook_pro?view=documents

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