Helping people with computers... one answer at a time.
When a Hotmail account shows a virus, it's a good sign that your account has been hacked. You'll need to change all of your security information to regain control.
A friend of mine, who has a Macbook Pro, has informed that in my emails which I've sent him is hidden a virus. I scanned my computer with Norton. I found nothing.
In this excerpt from Answercast #7, I look at the difference between accessing Hotmail online or through a computer-based program and outline the steps needed to clean up that account.
I see from your question submission that you're sending from a Hotmail account. My guess is that you are accessing Hotmail through the Hotmail website and not a program running on your PC.
If you do a scan with your anti-virus program, you are scanning your computer: not your Hotmail; not the website. You're not scanning the way that you access your email. If you were running an email program like Thunderbird or Outlook, then an anti-virus or anti-spyware scan would make sense.
When you access email primarily through a web interface (like you do with Hotmail), what happens in a case like this is that your email account has most likely been compromised; it's been hacked into.
Somebody else knows your password and is logging into your email account from some other computer; quite possibly from some other country, some other random place out on the internet elsewhere on the planet.
As a result, your machine may not have any viruses at all because that just doesn't apply here. The hacker isn't using your computer to access your account; they're accessing it directly.
The thing to do is to immediately change your password and then also change all of the other information in your account that could be used for a password recovery. While the hacker has access to your account, they can look at many of the settings that might be used to do a password recovery.
The scenario that you need to avoid is this:
What you need to do is regain access to your account (or have access to your
account) and change your password. Change all of the information that could be
used for a password recovery to further secure your account.