ORCAD PSpice 16.6 cannot simulate diode circuit properly
Try adding a ground node (see left side):



simulate this circuit &ndash; Schematic created using CircuitLab
The netlist would be something like:

R1 N2 0 5k
C1 N2 0 22µ
D1 N1 N2 1N914
V1 N1 0 SINE(0 3 1000)

Just note the use of 0 for ground.
EDIT: Okay. So you are using a ground. That's good. There is often a parameter to let you arbitrarily connect every node to ground via a high impedance value (GMIN.) But I don't know how you'd access it in your simulator. So lacking that, try the schematic on the right side, now, as shown above.