Hotmail & MSN Downloads/Widgets

I am using Sandboxie Paid (latest version) with both Internet and Start/Run Access Restrictions.

Today, using Internet Explorer 8 for the web browser:

In Hotmail I got a Warning message from McAfee Siteadvisor about downloading something for Silverlight. Also, Sandboxie would not allow the execution of agcp.exe.

When I logged out of Hotmail and clicked on one of the MSN articles, I got a message from McAfee Siteadvisor if do I want to "block" a "potentially unwanted" Widget. Also, Sandboxie would not allow the execution of agcp.exe.

Prevx lists agcp.exe as Malicious Software:

http://www.prevx.com/filenames/X1713956996926649494-X1/AGCP.EXE.html

Are the above anything to be concerned about?

Thanks in Advance.