Pop up window “Disk Util” problem.

Thanks. This is the first of two replies so be sure to read the one that follows.

Adware was installed on that Mac a long time ago. Whether you were aware of it or not, it has not been operating properly since then. macOS's improved malware detection algorithms are only now making you aware of its presence.

To fix it follow the instructions below. To learn how not to make that mistake again, please read How to install adware.

First, ensure you have a reliable backup of your Mac, in case something should go wrong with continued troubleshooting. To learn how to do that, please read Back up your Mac with Time Machine.

• A backup is a fundamental prerequisite regardless of whatever method you may choose uninstall adware, and would apply even if your Mac were running perfectly well. Do not overlook this fundamental requirement. It's important.

Next: This step will prevent the scam products from loading so that they can be removed while they are inactive. Restart in "Safe Mode", and log in: Use safe mode to isolate issues with your Mac. Starting in Safe Mode takes longer than usual so let it finish. The rogue processes affecting that Mac are inoperative in "Safe Mode".

The following files and / or folders need to be deleted while using your Mac in "Safe Mode":

First screenshot:

Nothing needs to be deleted from the other screenshots.

Drag those selections of files to the Trash. You may be asked to authenticate. Confirm they are no longer present in that folder. Leave all the others alone for now.

Next: open Safari and select the Safari menu > Preferences... > Extensions. If you see any Safari Extensions that you do not recognize or understand, simply click the Uninstall button and they will be gone. No Safari Extensions are required for normal operation. Then, select the General pane and review your Homepage selection. Repeat those equivalent actions for any other browser you may use.

There may also be adware-associated app icons in your Mac's Applications folder. Open it and examine its contents. Any unwanted or mysterious app icons should be obvious to you, but again please don't remove anything if you are uncertain—ask first. Identify any suspicious apps by name, or post another screenshot.

Next: In an abundance of caution, examine System Preferences > Extensions. Determine if there are any System Extensions that may have been installed without your knowledge. Ask if you're uncertain.

Remaining in System Preferences, check for the presence of any Profiles. Profiles are installed by organizations with a need to manage Macs deployed in institutional corporate or educational environments (for example), but have also been exploited by adware creators and similar malcontents. If any Profiles are installed on your Mac an icon like this will appear in System Preferences:

If you see that icon in System Preferences, select it. To remove a Profile, select it, then click the [—] (minus) button and authenticate.

Remaining in System Preferences, open Users & Groups. Select your User Account's Login Items. You may or may not find those Applications in its list. If you do, select them then click the [—] (minus) button to remove them from Login Items.

You can then restart your Mac and log in as usual. Evaluate its operation and ensure everything is working as you expect it should.

Additional information follows in my next reply.

Reply part 2 of 2:

Next: if you want to eradicate all remaining adware remnants post a screenshot of the following folder, in the same manner as you did earlier:

~/Library/Application Support

It is normal for that folder to contain many items, but anything associated with the above adware may contain identical names. If you find a folder or folders bearing those names, drag those folders to the Trash. Without the files you already removed or the reintroduction of similar malware, they can do nothing but occupy space. These can be removed if you wish, but again don't remove anything if you are uncertain.

Next: "ZipCloud" may be a useful product that you wish to use, but please be advised it has a dubious reputation for having bundled notorious adware along with its installer package. The screenshots you posted contains evidence of that malware, however, whether it was installed concurrently with that product cannot be determined. If you require an offline "cloud storage" solution I encourage you to use Apple's iCloud rather than some third party product—especially if it's "free". "Free" services derive their revenue by selling the information you upload to them, when they should be paying you instead. If you agree with that assessment I recommend uninstalling "ZipCloud".

Finally: If any of the above actions result in abnormal operation or if something else stops working, the easiest way to recover would be to restore the Time Machine backup you created as a prerequisite, so the importance of that fundamental step cannot be overemphasized.

In the same manner you already did, repeat that exercise with the following two additional folders:

/Library/LaunchDaemons

/Library/LaunchAgents

Notice the last one's pathname is different than the one you already posted. The Finder's Go menu > Go to Folder... field should look like this:

In the end, you will have captured the contents of the following three separate folders:

~/Library/LaunchAgents

/Library/LaunchDaemons

/Library/LaunchAgents

Post the entire contents of those last two as well.

You can definitely delete the files containing the following in their names:

AnyVideo

AppCleaner

audacious

calculator

iLivid

iTube

MacKeeper

mafnw

Spigot

TuneUp

youtir

Certain others can be removed, but those are a few obvious ones.

Can you send a screenshot? Command+Shift+3 or Command+Shift+4