I would like to add another warning...
Its similar as Haldir's...
sometimes it happens, that some contact you have "says" to you some good comment like "Oh, Look at this image please, What do you think?", "Look at this sunset, I would like to be there to see it myself", and bam! it sends to you an ZIP File, When it happens it, DENY the ZIP folder, cus it have an MS-DOS application like Carhartt said, and it is a VIRUS!, and it fucks your PC up...
So if a contact you have "says" to you something similar about photos and images, and bam! a ZIP folder, Do not accept it even if it is from your mother...
Q: "But i do not think that is the virus you are talking about, John, It maybe IS my friend who is sending me the zip folder with the images, How to know if it is him or the virus?"
A1: When he "says" to you about the image and bam! it send to you the zip file, Ask to him: "Hey man, Whats that you are sending to me"?, If he replys with "what? I didnt send you nothing", Then is virus (This also applys to Haldir's warning")
A2: Download the zip, and explore what is in the interior, Do not worry, As long as you do not touch what is inside, there is no prob... and watch the file inside's format, If its an application, It is a VIRUS...
A3: If your contact is a friend that, as you, is not from a country which speaks english and you speak with him other language (Finnish, Estonian, dutch, portuguese, spanish, etc), Like your RL friend, and when he "says" the image and zip folder thingy, he does it in english, Why he would say it to you in English if you are his RL friend?... Its virus...
This virus I am mentioning, that "says" to you about an image that he wants you to watch, like "Look at my hair man, What you think? too dark?", "Do you care if i put this pic of you in my homepage?", or smth that reffers to pics and sends a ZIP file... is a virus over the MSN and many ppl were victim of this virus...
Regards
-John