NIS 2011 Downloaded this VEZxSs1nn.exe.part file - pop up said 'safe'? Duh?

Has anyone else seen this? I'm running the latest version of NIS 2011 and a pop up came up saying file 'VEZxSs1nn.exe.part' was safe? I wasn't downloading anything at the time but the info seems to suggest it's part of the 2011 upgrade [done weeks ago] ie file  NIS-ESD-18-1-0-37-EN. [See attachment of Norton Info box]

 

It doesn't look normal and I Googled it but no hits. Any advice would be appreciated. Am I infected? Has Norton been compromised?

 

Thanks in advance.

 

George