Its easy

All internet connections come with a quick install sheet as follows:

1) Your bank (online or otherwise) will never ask you for your account details

2) You do not have any rich and recently deceased relatives you have never heard of

3) Even if microsoft / yahoo / <large corporation of choice> *do* run a lottery, you have not won it - especially as you didn't enter it in the first place

Now, in order to install your internet connection...