Q: still receiving "nsurlstoraged quit unexpectedly" error in El Capitan

In general terms, the test does what I wrote in part 3 of my last comment. If you prefer not to run it, I can only make a generic suggestion, and I don't know whether it will work.

Please back up all data to at least two different storage devices, if you haven't already done so. One backup is not enough to be safe. The backups can be made with Time Machine or with Disk Utility. Preferably both.

Erase and install OS X. This operation will destroy all data on the startup volume, so you had be better be sure of the backups. If you upgraded from an older version of OS X, you'll need the Apple ID and password that you used, so make a note of those before you begin.

When you restart, you'll be prompted to go through the initial setup process. That’s when you transfer the data from a backup.

Select only users in the Setup Assistant dialog—not Applications, Computer & Network Settings, or Other files and folders. Don't transfer the Guest account, if it was enabled.

After that, check the App Store for software updates.

If the problem is resolved after the clean installation, reinstall third-party software selectively. I can only suggest general guidelines. Self-contained applications that install into the Applications folder by drag-and-drop or download from the App Store are usually safe, but in this case they may not be. Anything that comes packaged as an installer or that prompts for an administrator password is suspect, and you must test thoroughly after reinstalling each such item to make sure you haven't restored the problem.

I strongly recommend that you never reinstall any "security" products or "utilities," nor any software that changes the user interface, or the behavior of built-in applications, in an unsupported way, nor any unlicensed commercial software.

Before installing any software, ask yourself the question: "Am I sure I know how to uninstall this without having to wipe the volume again?" If the answer is "no," you could be creating a future problem that will be very hard to solve. Never install any third-party software unless you know how to uninstall it.