My Laptop takes a turn!

Hi friends, happy Sunday! Whenever I open my mailbox, there would be a hell lot of unread mails and it takes me at least an hour to open up one by one and to give in a suitable reply. I am least bothered to open my Spam folder and it so happened recently that in order to delete all those spam mails, I went to the folder. A mail's subject attracted me and that's it I opened the mail. Th sad part here is that my anti-virus just got expired and I have ordered a new pack to be installed. My laptop took a turn! After some 30 seconds, I noticed that something has went wrong and my laptop got affected by a Virus. At that moment, I gave a try to restart and it failed to boot up. I was in a maze. I really can't get to know what was wrong. The error thrown was some I/O device failure. Oh my God, then I called up the online support people and got my hard drive replaced. So guys, please beware while opening your mailbox. Never give in for spam mails.