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Norton Security Delux / Norton Utilities
NIS Deluxe has Norton Utilities as a package and after I installed Utilities all seemed well as it cleaned up the file system.
A day later I lost my working files and couldn't open my electronic diary because Utilities had deleted them.
I managed to recover them from an earlier backup ok and then I uninstalled Utilities never to see it again.
If the software had been released for testing these problems would have been sorted out as we used to do a few years back. There is no way I will install it again.