Wireless internet connection issue

Hi, so recently i have been noticing some serious issues with my wireless internet dropping out on my laptop. It seems to drop out more when i'm on skype which is very annoying and originally i was lead to believe skype was the issue but now i realize it also happens when i'm off skype. There are 3 other devices connected to the internet at a time but that can be fixed (iPhone, iPod & another laptop) which all do not experience drop outs so i believe its not an issue with the modem router. If anyone could please provide some help as i have looked around on forum posts and have not been able to resolve my problem. I will provide some more details to hopefully help you fix my issue.

Modem Router: Billion BiPac 7700n
Broadband: Internode- 150gb
Location of Router: Directly below me on the 1st floor (I'm on 2nd floor)
Have you tried Ethernet connection: no i haven't but i'm able to if needed
Network adapter: Intel Centrino Wireless-N 2230
Laptop operating system: Windows 8 64-bit
Anti-Virus program: Free Avast

Thats all of the information i could think of, hopefully someone is able to help me thanks.

As you are using avast. There's an option in avast to enable or disable network lock. Check that may be someone or you yourself accidentally activate the network lock. In the Task-bar Tray, right click on the avast icon. And then check that if there's an option to ''disable network lock'', then disable it. If it shows ''enable network lock'', then problem will not that.
Go to the Control panel, in internet option, under the Advance tab, Click on Restore Default Settings. Then click on Reset.
Hope that work.

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