An MSN Virus

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Just yesterday I was on MSN and I recieved a message from a friend saying that she had just made this image on photoshop. It also tried to get me to download it. Feeling slightly confused (it was a .zip file with a strange name), I downloaded it. After unzipping it and finding nothing, I was confused. Then I asked this person why they had sent me this and they had no idea what I waS talking about and then said that I had tried to send them a photo. I know now that this is a virus. I think I have killed it but am not sure. What does this virus do, and is it spyware, adware, or a trojan? Thanks