Noob question on OS changes

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Joined
28 Feb 2008
Posts
9
Hi, just a couple of quick questions regarding operating systems.

1) If for example I were to change from Vista Basic (64bit) to Vista Premium (64bit), is it just a case of whack in the new disc and it will 'over-write' the basic disc & replace with the premium or will it be more complicated than that?

2) Assuming it does just over-write, will all programs & files previously installed be ok, or is changing the OS more akin to a total reboot?

Cheers in advance.
 
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