There's certainly been some heavy customisation going on over the years, if Windows XP boots and runs from drive F: (you said that's the only disk in the system nowadays).

F: is well up into the disk letter area usually reserved for removable and/or network drives. I've sometimes run into problems up there with overlapping definitions - plugging in a memory stick to a system where the next available drive letter has previously been mapped as a network drive, for example. The BOINC installer is certainly aware of the differences between local and network drives - an installation in /admin mode will default to the first available network drive, for example.

Some of the issues raised seem to be similar to, though not identical with, the problems discussed in https://github.com/BOINC/boinc/issues/792. Check that the registry entries for installation and data directories left behind by the most recent working installation still point to locations which are valid for the current configuration - the installer will try to use them for the new installion locations this time round, as well, and will fall over if it can't find them.

XP boots, and BOINC runs from the F: drive. This machine is my experimentation node, in the time it has existed, it has had numerous disks and devices in it. Previous versions of BOINC have always installed without issue on here.

In the registry, under the key "Space Sciences Laboratory, U.C. Berkeley" there are sub directories for "BOINC Manager" and "Boinc Screensaver" both of which have a few items, but nothing resembling a location.

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Wave upon wave of demented avengers march cheerfully out of obscurity into the dream.

There are two registry keys called "Space Sciences Laboratory, U.C. Berkeley".

The one you're quoting is in the 'Current User' hive, but the one you want to look at for setup issues is in the 'Local Machine' hive:

HKEY_LOCAL_MACHINE\SOFTWARE\Space Sciences Laboratory, U.C. Berkeley\BOINC Setup

The locations in question are

INSTALLDIR (for programs)
DATADIR (for ... guess what)

Ah, okay, I'll have a look when I get back later today.

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Wave upon wave of demented avengers march cheerfully out of obscurity into the dream.

Okay.

DATADIR = F:\Documents and Settings\All Users\Application Data\BOINC\
INSTALLDIR = F:\Program Files\BOINC\

Both directories exist and are populated with loads of stuff. Files, (.xml's for example), are readable, no issues there.

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Wave upon wave of demented avengers march cheerfully out of obscurity into the dream.

Charlie,

All problems seem to have gone away with the upgrade to Mac El Capitan. I guess something got corrupted.

Jim

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Thanks,
Jim

I put 7.6.6 back, so am working fine again.

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Wave upon wave of demented avengers march cheerfully out of obscurity into the dream.

All problems seem to have vanished with he upgrade to Mac El Capitan.

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Thanks,
Jim

Sorry, forgot about this thread. I re-installed 7.6.6 and running again.

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Wave upon wave of demented avengers march cheerfully out of obscurity into the dream.