Question about Outlook Express

in this email it says:

Dear Broadband Customer,

We are notifying you that your computer has sent spam email's from your IP "69.49.30.200"
Please remove all viruses and adware ASAP or we will have to suspend your home internet connection.

Scan Here - to Stop Your Account Suspension

Thank You,
Customer Service Department

I've gotten 14 of them since 7-19-12.
I don't spam anyone, and know I have no viruses or adware, so what gives.....