Q&A for How to Clean the Windows Registry by Hand

You can probably use the program CCleaner for this, as there is a section to delete registries.

Ignore it, if you can. Make sure to safely remove your Kindle (and any USB device, for that matter) by ejecting it! Doing so will often fix those issues. You can also delete your USB controller from the device manager and restart your workstation/computer, and that'll reload the USB logs.

Just follow the steps in this article. However, it's recommended to always backup your registry first and only do it if you know what you're doing.

Hold down the windows key and the "r" key and type regedit. You can then manually browse to what you need or use ctrl and f keys to open the find function and search out strings. You can then use the delete key or right click and delete on entries.