Gets even more interesting. Removed HDD Health via XP Add/Remove and was requested to reboot computer after removal. This I did. On return the programme was still there, and was eventually removed (hopefully) by the programmes own uninstal procedure.
The computer now seems back to its old self, so I will tick as resolved, but please add further if you know anything about the two download programmes: HDD Health and IObit SmartDefrag Beta 2.1.
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