Yeah I meant before you show hidden items. But I don't think it is necessary.
First run this WinKey + W > Diagnose your computer memory problems. It may run for a while so find a movie. I don't know how long it will take it may be fast.
If those come back good try this if not then let me know what it says.
Try this and let me know if any of those issues are fixed. Take all but one stick of RAM out and see if you can open those programs or use the USB port. If no to all then swap out the one left for a
new one. Different one :)
If that exception code is referring to the link bellow and with all the other issues your RAM could be the cause. The CPU can also cause these random issues. Were you able to update the chipset for the CPU?
http://msdn.microsoft.com/en-us/library/windows/hardware/ff560192(v=vs.85).aspx