.tmp file accessing the internet on bootup?

I have noticed in the Norton History (NIS 2012, on Windows 7 64), a .tmp file accessing the internet every time I reboot.

 

The file is located in c:\Users\<username>\AppData\Local\Temp\  and is called _iu14D2N.tmp.

 

I have tried to find the file in that location, but even with hidden and protected operating system files visible it is no where to be found.

 

I have run a scan with Norton Power Eraser which says no risks detected, but the only things I could find via google suggested this was a rootkit?