Just logged in tonight to update where I had got to and saw your reply - thank you. So through a process of elimination I worked out that the malware must be linked to the task scheduler. On checking tonight I found a task that I didn't recognise. Downloaded and ran Malwarebytes for confirmation and yes it was a PUP. Deleted and waiting to see if problem re-occurs although confident it won't. Thanks for taking the time to respond.
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