Could you update your full system specs in your profile, please?
The last 3 BSODs you had - 2 were 1E errors caused by ntkrnlmp.exe and you had a 3B error caused by fltmgr.sys.
Could you uninstall AVG and install MSE for testing purposes, and also disable/uninstall AppleCharger as this can cause problems (http://www.gigabyte.com/support-downloads/utility.aspx
- The On/Off charge utility. Not the one for Intel 7 series).
Try running sfc /scannow, also if your motherboard has a parallel port, then disable it within the BIOS.