Hey Terrie,
I had the exact same issue, with the exact same corrupt dll filename, I figured out a workaround but I don’t like it, and I would love to figure out a more permanent solution.
I just haven’t had time to pour into a fix.
Here’s how I get around it:
1. Disabled my Antivirus Prevention Engine
2. Navigated to ProgramFiles/Overwatch/_retail_
3. Double clicked on the Overwatch.exe
4. If 3 doesn't load the game I right clicked the Overwatch.exe and clicked Open
5. Re-enabled my Prevention Engine
(Sorry I had to put it in a code block otherwise the underscored retail folder gets interpreted as markdown formatting like retail)
Note: This doesn’t work for me if I try and launch the game through the Battle.net Agent, even after disabling the Prevention Engine.
I also didn’t have anything show up in my Antivirus Software, and I scanned all dll files on my system and none had the corrupted filename mentioned in the error.
Hope this helps you.