Try removing AVG
go here
Free Antivirus | Forum - AVG 2011 + 9.0+8.x Uninstall / Re-Install Instructions
use the link to the uninstaller as well as the directions for removing left over folders when uninstall is complete.
Do not re-install
Reboot, see if the networking between the laptop and PC improves. Consider
Link Removed due to 404 Error as a possible replacement product if needed.
On both machines enable NetBIOS over TCP/IP in the properties of IPv4, under the WINS tab, within the properties of your network interface card.
On both machines check services
type services.msc into the search box and hit enter
confirm that the following services are started, consider setting the startup type to automatic
Computer Browser...