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According to this article on the Microsoft MVPS site, “WJView Error on Startup” it’s likely a symptom of spyware. You can follow the instructions there to correct, or you can grab a copy of a spyware removal tool such as Spybot or AdAware and they should clean it up as well.
Using Disk Cleanup in Windows 10 - Disk Cleanup in Windows 10 is a handy tool for freeing up space on your hard drive. I'll show you how it's done and what to clean up. It's one of the first places I recommend people turn when they're running low on disk space.