Originally Posted by Bedtrick
Actually I think detecting is a better word.
can I get some help with this please?
had the same problem, get the latest version, 0.8.70 (windows) from here
Update Calibre, the new version supports MTP devices like the Nexus 7.
Make sure that Nexus is connected / detected by PC.
Start Calibre, should see the device. If you move books to the device, look under sdcard\ebooks to add content to your favorite reader app.
Hope this helps.