download from here
select either 32bit or 64bit according to what your PC is
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what problems are you having at the moment?

ps. if you are unsure then download the 32bit it will still work on a 64bit PC

You never told me what the problem was.
did original library go missing when you opened Calibre given that you said you saved your old one.

There can be two reasons why calibre is showing a empty list of books:

Your calibre library folder changed its location. This can happen if it was on an external disk and the drive letter for that disk changed. Or if you accidentally moved the folder. In this case, calibre cannot find its library and so starts up with an empty library instead. To remedy this, do a right-click on the calibre icon in the calibre toolbar and select Switch/create library. Click the little blue icon to select the new location of your calibre library and click OK. If you don’t know the new location search your computer for the file metadata.db.

Your metadata.db file was deleted/corrupted. In this case, you can ask calibre to rebuild the metadata.db from its backups. Right click the calibre icon in the calibre toolbar and select Library maintenance->Restore database. calibre will automatically rebuild metadata.db.

  Hi--thanks for  the help.  My problem was that CALIBRE will no  longer work on windows 7 unless  you download 3.48. I can  pull it  up  and the books are  there but  you can't put on desktop  or ebook.  On  the  page where you download calibre it states   3.48 will work on all windows.  It also states to remove calibre and download 3.48.  If  I do that won't I  lose my books.? THEN HOW DO i GET THEM BACK.
         I also have Webroot   SHOULD i DISABLE THAT  FIRST-THEN HOW DO I GET MY BOOKS INTO CALIBRE?

               PLEASE HELP-THANKS.

"but  you can't put on desktop  or ebook"
Not sure I understand this statement - isn't your existing Calibre on your Desktop using windows 7 ?

If your books are currently on your desktop you will not lose them by deleting the Calibre program itself. The program itself does not store your books within it. They are stored in a directory on your computer. The program only looks for the metadata.db file on your computer and all the information about the books is in that file.  Installing 3.48 should show all your files when you start it.

If it doesn't  - my previous post said how you can point Calibre to the directory where that file is if it cannot find it on install or if the file has been corrupted the second method as to how you tell Calibre to recreate the file.

Does anybody know where I can find the 3.48 User Manual?

Thanks