Hi,
Thank you for posting your query on Microsoft Community Forums.
As per the given description, your new Windows 8 computer constantly shows the message: "homegroup is sharing files” in the action center when you have not set up
a homegroup. I would like to have some information regarding your computer.
1)
Do you have multiple Operating Systems installed on the computer?
2)
Are you using Microsoft Account to login to the computer?
If at all you are connected to a Homegroup, I would suggest you to leave the home group and check the issue. To leave the home group, follow these steps:
a)
Press “Windows Logo” + “C” keys on the keyboard to display the charms bar.
b)
Click on “Change PC settings” link on the charms bar.
c)
Click on “HomeGroup”.
d)
Click on “Leave”.
For reference you can check this link:
http://windows.microsoft.com/en-IN/windows-8/homegroup-from-start-to-finish
Please do get back to us with the additional information regarding the issue.