You obviously didn't read the whole post. In particular read the first line of my response #1. You should not put your email address in open text on the internet.
You have been scammed and there is not much you can do about it. These people are nothing whatever to do with VIsta.
The important thing is to learn to browse safely and to reboot your computer when you get anything like that popping up again. They are usually very obvious because they say there are many viruses (to frighten you) which is unlikely in real life.
If you still have problems with the computer and have taken the steps already given in this thread then please raise a new post of your own.
Please do not post then vanish - let us know the outcome