AV 4.6 Home. Shared internet connection problem

I have a problem. Apparently I cannot share my internet connection between 2 PCs.
My laptop is connected Wi-Fi and has AVAST 4.6 Home. My desktop is connected through LAN.

I can share files and folders between the two, and even printer. Only the internet connection cannot be shared. ???

I wonder if it might be a problem of AVAST. I have no other SW installed for protection on the desktop and AVAST on the laptop…

Anyone willing to help??

Thanks a lot in advance for the time :slight_smile:

NETWROKING: instructions/tutorials/troubleshooting, file-/internet-/printer sharing:
http://compnetworking.about.com/od/homenetworking
www.wown.com
www.practicallynetworked.com
www.onecomputerguy.com