Your machine never crashes/crashed as there are no bsod crash dump files, so that is not an issue you have to deal with.
You're missing a very important NVIDIA SMBus MCP79D chipset power management driver:
and you also need to install the proprietary storage driver from the same chipset:
Coprocessor PCI\VEN_10DE&DEV_0AA3&SUBSYS_1FA71043&REV_B1\3&267A616A&1&1D The drivers for this device are not installed.
Visit ASUS' site for your motherboard to download and install latest of those. SMBus driver will be in the extracted folder of the same name. Use device manager to install both drivers if the installer doesn't install them well.
Name Standard SATA AHCI Controller
Manufacturer Standard SATA AHCI Controller
PNP Device ID PCI\VEN_10DE&DEV_0AB9&SUBSYS_1FA71043&REV_B1\3&267A616A&1&58
I/O Port 0x0000C080-0x0000C087
I/O Port 0x0000C000-0x0000C003
I/O Port 0x0000BC00-0x0000BC07
I/O Port 0x0000B880-0x0000B883
I/O Port 0x0000B800-0x0000B80F
Memory Address 0xFAE76000-0xFAE77FFF
IRQ Channel IRQ 20
Driver c:\windows\system32\drivers\storahci.sys (6.2.8250.0, 70,30 KB (71.992 bytes), 18/02/2012 05.37)
Install latest Atheros driver for your Qualcomm wireless adapter (AR9285):
ATHEROS Wireless drivers for Windows
Also update your router's firmware to latest and then after, reset it to factory defaults.
Uninstall AVG in safe mode with the special tool. Reboot and set Windows Firewall and Windows Defender to auto and start them too.
Enjoy the machine and Windows 8. Have fun.