I tried to upgrade from 7.0.28 to 7.0.64. 28 uninstalled, but .64 errors out at status "validating user groups used for Boinc for secure sandboxes" with "Failed to add user to the "boinc_admins" group (Administrator).

When I try to "downgrade" to.6.10.58, I get the "boinc admin" error above

Win 7 x64

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What kind of Windows 7? Home, Basic, Professional, Ultimate, Server, other?
Are you installing as an administrator?
Was the 7.0.28 version you used before also a 64bit version?

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Home Premium

Tried install as admin and non-admin. 7.0.28 was also 64-bit

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OK, thanks, I have forwarded that to the developers, as it should've been fixed in a built between 7.0.28 and 7.0.64
In the mean time, you can add the user manually to the group, by following this BOINC FAQ.

The weird part is that your previous version should've added the name to the group as well. But I leave that to the developers to figure out. It's possible I come back with questions from them, or they come passing by themselves.

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When I followed instructions in the FAQ,it said account already existed. And error still exists.

In that case, use net localgroup boinc_admins 'username' /delete first, before reinstalling (or repair installing).

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