On Vista, Win7 and Win8 the Documents and Settings folder is a junction to the Users folder, unless you tweak Windows you don't normally see it. It's there to facilitate backwards compatibility for older programs that use hard coded paths.
If you have a folder such as
C:\Users\BetterRed\AppData\Roaming\calibre on Vista etc, or
C:\Documents and Settings\BetterRed\AppData\Roaming\calibre on XP, then you either created it yourself (unlikely), or at some time you installed one of the 'regular' versions of calibre (most likely). When calibre is un-installed it does not remove that folder. This is by design, it means that if calibre is re-installed the old settings are used. Occasionally problems are solved via an un-install/re-install sequence.
If you only want to use the portable version of calibre then if it exists the ...\AppData\Roaming\calibre folder can be removed.
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Vortex - if you locate any additional libraries within the Calibre Portable folder itself, then you wont run into the drive letter issue. So your Calibre Portable folder might contain the following
Quote:
...\Calibre Portable\Calibre
...\Calibre Portable\Calibre Library
...\Calibre Portable\Calibre Settings
...\Calibre Portable\calibre-portable.exe
...\Calibre Portable\Magazines Library
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BR