Pixelated enlarged screen - display issues related to external hard drive

Hi. I had an external hard drive plugged into my macbook. I have a second monitor hooked up. My screen is pixelated and enlarged (I have to scroll to see the whole desktop). The icons are rearranged and very blurry. Everything is blurry and enlarged. My files will open, but they are all blurry as well. When I noticed these display issues, I realized the mac was not detecting the hard drive that was plugged into the usb port. I unplugged it and then a LOT of folders with the hard drive name appeared on the desktop and then disappeared. I know I may have misstepped by unplugging it, but what can I do now? I have rebooted, shut down, checked zoom and screen resolution settings, and unplugged the monitor. It's the same when I uplug the second monitor and just view my desktop on the mac. Any ideas? Thank you in advance!
NJ

There is a multitude of posts here addressing the dangers of using Mackeeper. But just look at this:
https://discussions.apple.com/docs/DOC-3691
While this particular problem may not have been caused by Mackeeper, I urge you to uninstall this piece of trash.
http://help.mackeeper.zeobit.com/Manual/GettingStarted/UninstallingMacKeeper.htm l

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tpetrini wrote:
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text below posted to other question relating to external hard drive problem.
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(109318)

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3) has at least 500GB storage
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Pixelated enlarged screen - display issues related to external hard drive

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