You find attached what (hopefully) you were searching for. The generators E1 and V1, respectively a linear dependent voltage-controlled voltage and independent voltage source, have been added because of Frequency Response analysis graph. Proteus makes use of standard SPICE analysis modes and, as a result, the OFFSET and AMP properties of the sine generator are removed once Frequency response analysis mode is made. The two generators restore the correct bias that makes your amplifier to work correctly. The correct offset is directly assigned in the Frequency response graph within the "User defined properties" field; the line X=1.5 assigns this value to variable X of the V1 generator.
About the GAIN vs VIN graph, a Dc Sweep Analysis mode has been used. The GAIN is simply computed by trace expression VOUT/VIN. I chose as the start and stop values those numbers that makes the simulation safe without warnings. Outside those values the gain is strongly non-linear and warnings about GMIN can be seen.
Just a note about the script:
I've added it just to allow for real time animation without warning about X undefined.
In the help file "Simulation Help", at the section ANALYSIS TYPES, you may get some further information about the analysis modes I've been used here.
