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Calibre is a databased book managing program. It doesn't download books and apply DRM the way that Sony library or Adobe Digital Editions does. You don't need to install the Sony library program to download books or load them on your reader. ADE will download them for you. Where Calibre shines is in organizing your books, attaching correct metadata, converting to desired formats, and sending them to your device in an organized fashion. There are some things that Calibre can't do to books with DRM.
To open your already purchased books on your new computer, you'll need to authorize your computer. The first time you launch ADE, it will ask you for your user name and password. After that, you should be able to redownload them from where you purchased them. Personally, I find DRM to be unwieldy, in that it prevents Calibre from converting my books or changing fonts. I also worry about being able to use the books in the future in circumstances like you're facing. I use a Calibre plug-in to strip the DRM as I move the book into Calibre and routinely back up my Calibre libraries. We don't discuss DRM removal here, but a Google search for ApprenticeAlf should provide all the tools you need.
If you use Calibre, there is one thing you can do that will really corrupt the database. When you add a book to Calibre, Calibre puts a copy of the book into the Calibre library. Any changes you make to the book in Calibre will applied to this copy. It's really important that you leave the Calibre library folders alone. It really seems to offend some people to find folders in the Calibre library that aren't named to their own naming conventions. If you might be one of those people, put the Calibre library someplace that you never go so that you don't have to see it.
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