@midnightmaze- AFAIK the only significant benefit of 64bit is converting very large books (eg KJV Bible etc), you also need a lot of memory to do that.
If 32bit is working for you I would leave it alone, if it ain't broke don't fix it.
If you really think you must have the 64bit version, then you can install it 'alongside' the 32bit version and it will use the existing libraries and configuration settings. You'll end up with a Calibre2 folder in the Programs Files and the Program Files (x86) folders. If you keep desktop shortcuts you'll have 2 of them for calibre, I'd suggest you rename the existing one "Calibre 32 bit.lnk" before installing the 64 bit.
BR
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