Oh.. Altium ditched CM for XSPICE when they changed Protel to DXP. I don't think upgrading to DXP or Altium 6 is a good option. Maybe SPICE3 is a better bet...
alright thanks a lot for your help.. I'll try what I can do.. One thing i'm curious about, is it possible to build an integrator op-amp with gain of 220 or maybe higher using (LM741)?...Thanks a lot...