If someone sends you a file, eg "Look at this new photo! 43234.zip", do NOT click it!
If someone sends you a link and goes "Hey, do you like this photo of you I uploaded? <LINK>", do NOT click it!
If you get an email saying MSN will cost money, it's bullshit; MSN will never cost money, nor would they send you an EMAIL about it, it'd be all around the news.
Any questions/concerns about MSN eg emails, viruses, suspected viruses etc should be posted here.
Thanks.