Workbench won't run on Vista - DEP

I've been running Workbench for some months now happily on my PC.  Last 
week I rebuilt my software on my PC with exactly the same OS as before 
(Vista Home Premium SP1.)

However now after re-installing Workbench (5.0.27 OSS) when I run it, it 
shows the splash screen for a few seconds then crashes and Windows 
helpfully informs me that it closed Workbench because of DEP.

I've tried disabling DEP for Workbench (System Settings > DEP > "Turn on 
DEP for all programs and services except those I select" > Add workbench 
to the exclusion list) but Windows says that Workbench needs DEP enabled 
to run correctly - but then it won't run workbench with it enabled 
(flawed or what?)

Is there any way I can turn this thing off and run Workbench as I used to?

Thanks,

Andy

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