Error Code 1073741819 (0xC0000005) -- attempting to write to virtual address for which there's not appropriate access . . . ?

[Windows 10]

I received the following pop-up error message. I have no idea what it signifies.I searched Google, and found that the error could have connections to the NET framework. Microsoft's recent update (KB5050188) had something to do with NET . . . so, is that it? Another search indicated possible malware activity. I'm using Bitdefender AV Plus, which is turned on. So, I'm not sure that's it.I was converting a video from a proprietary format to MP4 when this happened. The software is Flashback Pro 5. Never had this happen before.Any thoughts?Thanks!

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