having a outlet without physical ground results in static shocks and video distortions on your system, (i.e you see wavy lines on your monitor, get shocked when your elbow or forearm touches a connected usb cable etc.) but all is not lost, if you have a stander voltmeter you can use it to test your outlet.
first you need to connect the black wire to the voltmeter's com port, and the red wire to the v(ohm) port.
like in the picture below
the longest slot is the common ground , that's where your black tester goes, the other slot is "hot" (gets you electrocuted!! caution!! do not touch!!) that's where the red wire goes, always connect the ground wire first then the red wire, and remove the red wire first then the black wire.
to test if you're grounded leave the red wire connected, remove the black wire and insert it in the small round hole.
if you get the same voltage as when you took your first reading your grounded, if you do not get any reading, change the red wire to the other slot.
if you get a reading , then your house is reversed wired, ( you need to fix this as you can experience over heating load wires, short circuits etc.)
if you still dont get any reading then your not grounded.
to ground an outlet you will need :
1 copper coated grounding rod.
10 gauge wire
1 grounding rod clamp
you can buy everything at your local hardware store for under 30 bucks
find the closest place to drive the rod into the ground, could be outside your house,, drilling a hole through your wall, or drilling directly into the floor.
(keep in mind that any conducting material can be used as a grounding rod, (i.e iron rod, copper rod, etc. but grounding copper rods are recommended)
drive the rod into the ground until its barely visible, then clamp the wire to the rod, and finish driving it into the ground, then drive the wire to the outlet, you can fasten it to the wall with a cable race way to hide the cable.
then turn off the electrical power, ( pull the circuit lever)
test to see if you have power in the outlet, once you're sure there is no power , unscrew the outlet,
at the very bottom there is one screw, this is the ground terminal.
connect the ground cable to the terminal and screw int tight.
then replace your outlet , check that there is no continuity with the wires (i.e the wires are not touching anything)
finally turn the power back on.