Windows 7 Troubling Unknown Device in Windows 7 Network Map: Possible Security Concern?

[simon591]

In Windows 7, when I go into Control Panel - Network & Internet to view my Home Network, click 'see full map'
I notice a question mark device icon noted 'unknown'. It has no address or any other information. It only disappears when I reboot. Has my computer been compromised by a hacker? There has been some unusual activity.

 

[Jimbo22]

Do you visit public wifi hot spots? If so, it's certainly possible.

 

[simon591]

Do you visit public wifi hot spots? If so, it's certainly possible.

No I only use a home network - it is a PC not a mobile or laptop/tablet.

 

[rbeldua]

can you give us a screen shot?