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Well, that's your call then. I gave you about all the suggestions I can, since I don't have the same phone.

To recap, you installed the driver (from both the "CDROM" option and download), and...

The phone would need to support USB-OTG.

How are you removing the old drivers? If you're just going through Control Panel, I think you should try Geek uninstaller to really remove the files....

Hmm. That is really weird. USB Debugging wouldn't help unless you are doing a push/pull from ADB command prompt.

If anything, the media storage or camera settings would be the ones to use.

You...

You should have unplugged the USB first.

Does anything show up in Device Manager when you have the phone connected?

ADB is for running commands from command prompt to the phone. You don't need...

After you uninstalled the drivers, you should have reinstalled them BEFORE connecting to the USB port.

I'm guessing you mean this:
https://support.microsoft.com/en-us/kb/2500967

That's about...

Hmm. That is odd.

Did you look in Device Manager to see if the phone was recognized properly?

Did you looking Control Panel > Programs and Features to see if the driver software was installed?...

One more thing, what type of USB port are you connecting to, USB 2.0 or 3.0? I've seen issues with some phones and USB 3.0 ports.

Well, you still haven't posted which carrier you're using, so I can't really look it up. Z820 isn't enough. For example, T-Mobile calls the Z820 their "Obsidian" phone.
...

Did you scroll down and enter your phone model info? Like I said you need to provide your carrier info also.

Did you download the Windows drivers from the manufacturer's site? You should install the drivers BEFORE you connect a USB device.

Which carrier are you using? You can try looking up your model...