Thanks MJ for your response. I'm very grateful to you.
I've searched for the file but didn't come up with anything. I suppose I was a bit hasty in doing a system restore and should have quarantined the wretched thing before doing so. I am reluctant to reverse the last system restore in order to re-instate the infected file, although I concede that this may be worthwhile in the final analysis.
I ran AVG Anti-Spyware this morning and it didn't find anything. I'll run some other tests shortly.
As mentioned I have serious worries about this as I carry out online transactions vital to the financial health of my retirement years.
They're still some way ahead, so still a lot of time to worry in every respect.
Thanks again,
N o t a