Hi BARRYFC1,
If it's the latest version of Reader Library that you downloaded (I think that's v3.3) then you don't need to re-install Adobe Digital Editions because it's built in to the Sony Reader Library software.
But, as you've had to rebuild your computer, I'm guessing that you will have to re-authorise your PC for Adobe Digital Editions so that you can read copy protected eBooks again.
Usually the Reader Library software will prompt you automatically to authorise your PC (and/or Reader) when you download a copy protected eBook - i.e. something you've purchased from somewhere like Waterstones, WHSmith etc.
One thing you could try to get the software to do this, is to re-download an eBook that you've previously purchased e.g. one from before your computer corrupted (most retailer websites have an order history section where you find your previous purchases). If you press the 'download' button and choose the 'open' option, if the computer needs authorising you should see the prompt appear - it's then really important that you use the same Adobe ID (and your accompanying password) as you did when you first registered with Adobe. That should authorise the PC (you can check afterwards if you click on the 'status' icon in the left hand panel of the software if it's been done). Then you can drag and drop this eBook you've just downloaded onto your Reader when you connect it to your PC. Again, if the Reader needs authorising, then you'll see a similar prompt where you'd have to use the same Adobe ID and password as before (however your Reader may still be authorised so this might not be necessary).
Hope this helps you.
