Will I lose everything if I upgrade?

Forgive me if this is a stupid question, but if I run the upgrade to Yosemite (I'm currently on Mountain Lion), will I have to reinstall all my software? Will I lose everything on my hard drive? I've backed up to Time Machine but can it restore stuff if the operating system has since changed? I have a Boot Camp partition too, will that be affected? I'm just a bit nervous at the hassle this is going to cause, especially when I read other comments on here where people are experiencing major problems after upgrading.

Innings wrote:
Yosemite is slow, the lay-out worse than Snow Leopard, and I have a problem that refuses to let me run some programs.  Apple want to charge me £25 to tell me how to solve the problem.  Don't even think of using Yosemite, it has not one feature to recommend it.  I'd revert to Snow Leopard in a blink of an eye if I knew how to do it.
If you'd like to try to fix what's wrong with your Yosemite installation, or if you'd like some help with going back to Snow Leopard, we could help you with that. In that case it would probably be better to start your own thread and give some more information. You can download Etrecheck, http://www.etresoft.com/etrecheck, which is a small free app that can generate a system report which you can then post in your new thread.

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