I just registered on this forum to share the solution that worked for me.
You might not be able to remove the DRM from books downloaded using
Kindle for PC 1.6. What you need to do is the following:
- Uninstall Kindle for PC 1.6
- Delete the books in My Kindle Content folder
- Install Kindle for PC 1.41. You can find it here:
http://amzn.com/gp/feature.html/ref=sv_kinh_1?ie=UTF8&docId=1000493771 - Download your books using Kindle 1.41
- Proceed to removing DRM
It's important to note that this is book files specific. I suspect that the new Kindle for PC adds something to the files to counter DRM removal that's why it's important to re-download the books using the older Kindle for PC.
Hope this helps.