For a while now I have been receiving some emails that are suspicious at best. They always appear to be coming from someone in my address book, sometimes the same person but many times others. The subject is either... Hi Bill, To Bill, etc. (My name is Bill). The body of the email is strange links and always different (I never click on them). When I check to see the sending email address it is always different and a strange combination of characters (not the actual email address of the supposed sender). I get these several times a day.
My system is running Windows 7 Home and Norton Internet Security. I use native Gmail from the Google site (not a desktop product).
I have tried running full scans and and asked others to run scans on their systems. Nothing is found but these emails keep coming.
Does anyone have any idea where they may be coming from and how I can stop them? I'd appreciate any feedback.

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