Virus?

Some wierd stuff going on with my email lately. I keep getting a bunch of email from staff@digitalosophy.com. Now I know that isn’t even an account.

The email contains the following:
Dear user of “Digitalosophy.com” mailing system,

Some of our clients complained about the spam (negative e-mail content) outgoing from your e-mail account. Probably, you have been infected by a proxy-relay trojan server. In order to keep your computer safe, follow the instructions.

Further details can be obtained from attached file.

For security purposes the attached file is password protected. Password is “11505”.

Best wishes,
The Digitalosophy.com team

Of course, there is a zip file attached with an executable file which can’t be up to any good.

Is this a virus on my pc? I called my webhost the gave me the run around saying people are spoofing their outgoing mail servers.

I’m just not sure if this has to do with my PC. Norton doesn’t detect anything. and I’m using Outlook. Does this call for a format or what?