what is it?
fotos.zip is a file associated with the w32.beagle@mm worm

Where did it come from?
Usually you get these randomly in your inbox, so never download the attachment. It could be named foto1.zip foto2.zip foto3.zip or similar .pif or .exe...

What's it do?
W32.Beagle.AQ@mm is a variant of W32.Beagle.AO@mm, which is a mass-mailing worm that uses its own SMTP engine to spread. The email attachment is a downloader, similar to Trojan.Mitglieder and Download.Ject.C, which downloads the worm from an external source.

Recommendations
Use THIS google search
to view links to some antivirus programs that support email attachment scanning or email protection.

For people that use outlook or other pop services that automatically download your emails from a remote server I highly recomend using an antivirus program that scans all your email attachments before they can be opened..

More information and removal instructions
@symantec