I am getting reports of Malware within the enigma exe which my virus scanner quarantines. Is anyone else getting this?

Most likely a FALSE POSITIVE.
Best practice is to EXCLUDE ALL BOINC PROGRAM & BOINC DATA FOLDERS (including ALL SUB FOLDERS) from ACTIVE SCAN by the Anti-Virus/Anti-Malware program.

More details are required from you to help out. Let us stat with these 3 questions:
1) What is the NAME and VERSION NUMBER of your Anti-Virus/Anti-Malware PROGRAM?
2) What is the EXACT NAME of the supposed malware?
3) What is the FILE NAME the Anti-Virus/Anti-Malware claiming is INFECTED?

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The anti-virus program is BullGuard Internet Security version 17.1.336.6
The program is C:\ProgramData\BOINC\slots\2\enigma_av.exe

The report is:

Risk: HIGH
Behaviour: The program enigma_av.exe attempted to modify a protected system setting.
Time: 2017/10/19 03:50:49

As you can see it is trying to change a system setting.

Regards
mike

"... attempted to modify a protected system setting" == FALSE POSITIVE.
ALL BOINC projects attempt to create, modify and delete FILES & FOLDERS WITHIN THE BOINC DATA FOLDER.
This particular application runs on your GPU and thus requires access to some system settings to run on the GPU.

Like I recommended before:

Best practice is to EXCLUDE ALL BOINC PROGRAM & BOINC DATA FOLDERS (including ALL SUB FOLDERS) from ACTIVE SCAN by the Anti-Virus/Anti-Malware program.

EXCLUDE FOLDERS
1) Whatever folder you have the MAIN BOINC PROGRAM INSTALLED IN INCLUDING ALL FILES and SUB DIRECTORIES of the folder.
2 C:\ProgramData\BOINC\ INCLUDING ALL FILES and SUB DIRECTORIES of the folder.

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