I am running windows 7 with MSN and the McAfee Antivirus provided with MSN. 

Recently I have been receiving a pop-up balloon to update "Windows Essentials", the balloon has a wrench and an "X" in the upper right corner. So far, I have just been closing this balloon without doing the update. 

How can I tell what this update is for?  Windows essentials is apparently installed on my laptop, but I do not know if it is really running or what it does.  I tried to determine what Windows essentials is and it seems to have many parts so I do not know if I need this update.  If needed, why would it not be included with the usual Microsoft updates? 

I thought it might be for the Security Essentials, but since I am running McAfee, I do not need or want the Microsoft Security Essentials. 

How do I determine what this update is and if I need it? 

This question submission page is requiring that I select a Product and Topic within Windows Essentials - the only thing I know I use is Windows Live Mail, so I am just selecting this in order to get my question in front of someone. 

Thanks.