As of version 15.7 Maintenance Pack 2, Data Loss Prevention no longer uses Microsoft Visual Studio 2010 Runtime. This may result in not being able to run the executables in \program files \Symantec\DataLossPrevention\EnforceServer\15.x\Protect\bin
Listing below the executables in the bin directory that may not work as expected due to this behavior.
DLP 15.7 MP2
Put the JRE bin directory path in the system path environmental variable.
For example, if it is C:\Program Files\Symantec\DataLossPrevention\ServerJRE\1.8.0_202\bin then mention it as per the below screenshots: