Enhanced Write Filter (EWF) Manager Installation deletes fltsrv string from Upper Filters registry key
Symptoms
You install Enhanced Write Filter (EWF) Manager on the system where Acronis Backup and Recovery Agent for Windows is installed;
After system reboot, fltsrv string is not present in the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class{71A27CDD-812A-11D0-BEC7-08002BE2092F}\UpperFilters value:
Cause
EWF Manager deletes the fltsrv string due to incorrect registry key modifications during its installation.
Solution
Manually add the fltsrv string to the registry key value: