Defraggler Erroring on WHS v1 Server

I recently installed Defraggler on my WHS v1 Server and have been getting Application Errors - e.g. -

Event Type: Error

Event Source: Application Error

Event Category: (100)

Event ID: 1000

Date: 21/09/2015

Time: 14:40:04

User: N/A

Computer: SERVER1

Description:

Faulting application df.exe, version 2.19.0.982, faulting module df.exe, version 2.19.0.982, fault address 0x000029a7.

The Server has a Gigabyte GA-MA69GM-S2H m/b with 2gb of memory with an AMD Sempron Processor LE-1150 running under Windows Home Server 2003 Power Pack 2. The program seems to work OK when run from the desktop. Any ideas?