Hi SaaDua,
An ad hoc network is automatically deleted after all users disconnect from the network or when the person who set up the network disconnects and goes out of range of the other users of the network, unless you choose to make it a permanent network when you create it.
Refer the link below for more details:
Set up a computer-to-computer (ad hoc) network**http://windows.microsoft.com/en-US/windows7/Set-up-a-computer-to-computer-ad-hoc-network**
You may try the following steps:
- Click ‘Start’ and select ‘Control Panel’.
- Select Classic View and Network and Sharing Center > Customize > Merge or delete network location > Highlight the network then click Delete.
- Click the Advanced button.
- Make sure 'Access point networks only' is selected.
You may also refer the TechNet link below for a similar issue:
Hope this helps!
Regards,
Gokul - Microsoft Support