Susan,
Definately dont open any attachments and delete the whole message.
If possible, telephone the sender and have that person get the computer checked for the virus.
Further, install a good Anti Virus software like Norton, Macafee, or something similar. Worth their weight in gold.
Also, you can add the senders name to your list of barred receipients so it wont get as far as your computer.
You can always contact your ISP and tell them of your problems. They might be able to filter the messages as well.
Bruce,
The Tassie Devil(le),
60 CDV