Acronis Ransomware Protection software conflict
I recently installed Acronis Ransomware Protection, in part because it said it did not conflict with other antivirus apps. However, it severely slowed and then altogether stopped my Windows 10 system. The problem was resolved by uninstalling the app.
The antivirus in use is Windows Defender and I run fairly frequent scans with SuperAntiSpyware and Malwarebytes. I would note that it cost me quite a bit of $ in tech support to discover the problem. I did not suspect it due to the app's claim about working with other antivirus apps.