Your dumps point to
athr.sys as the probable cause.
athr.sys is related to your wireless network adapter.
Please update your Atheros Wireless Network adapter Driver to the latest version.
Your current driver release date: 2009-6-9
Latest driver release date: 2012-03-12
Also, it will be useful if you put those system information, in your
System Spec for future reference.
In addition, please
STOP using
TuneUp Utilities as it is notorious for corrupting windows, registry, etc