Are you using Outlook or Outlook Express??
If you are, you can block the address or domain from coming to you. Open Outlook, click tools, go to Message Rules, then Block Senders list, click add, type email@example.com or whatever it is, click mail or mail and news, click of twice and you shouldnt anything from that address again because it sends it straight to the deleted items.
If its hotmail, add them to the block sender list there.
And make sure you for viruses also.