Oh great! Two questions please can I stop it easily?
Could a System Restore, back say 3 days, help?
Last question first - no - not as far as I can understand the events.
Stopping it easily? That's a bit more complex. You can change your email address, but that usually creates lots of secondary issues, and is unacceptable in most instances.
I've been able to keep spam at bay by using a program which enables me to view emails at the ISP server before I download them, and delete and or bounce anything I don't like or want. The program is called Mailwasher, and you can read about it
here.
The idea is that by bouncing spam messages, your email address registers as a 'bad' one at the origin of the spam, and consequently gets deleted from the lists at the originating server. The theory is nice; I can think of reasons why it may not work, but in practice I found that it indeed does work. There may be other solutions; this is one which I have used for many years with good results.
Oh, yes. I should add that my primary ISP does have spam filtering measures which seem to be quite effective also.
I do hope you can put an early stop to this unwanted rubbish by whatever means you can.
Regards,
FOR