Welcome.
1) Uninstall AVG in safe mode with the tool you can Google and find. Reboot and install MSE.
2) Update Realtek lan driver:
Rt64win7 Rt64win7.sys Thu Feb 26 04:04:13 2009
Link Removed
3) Update this driver from the manufacturer's site or uninstall the software completely:
PCASp50a64 PCASp50a64.sys Tue Nov 28 21:45:19 2006
Here is a reference to what it is:
Link Removed - Invalid URL
4) Update your Atheros wireless adapter driver from the manufacturer's site of the adapter:
jswpslwfx jswpslwfx.sys Thu May 15 06:28:50 2008
If there is no update, uninstall the software and replace the hardware with something new.
5) If issues persist after doing all of the above, then post a screen shot of CPU-Z spd...