1.Make sure that if you're using OrCad and you are creating a new project that you have selected "Analog or Mixed AD" selection and not schematic.
2. Create your circuit and make sure it has a ground connection.
3. Click on "Pspice" menu "New Simulation Profile" and Type in simulation name.
4. In Analysis Tab of "Simulation Settings" Dialog click on transient (or Time domain) and type in the time length of the simulation and/or steps in which time is executed.
5. Click on "Pspice" menu (or a toolbar if you have it enabled), and Select Markers ->Voltage marker and place it in a ciruit where you want to view voltage.
6. Hit Run or F11 and the probe window will display the graphic
Google has a wealth of information on pspice and pspice help files for basic stuff are also quite good.