No worries - You are obviously a beginner and wanted to ID the simulator so you could get it and learn, so IMHO it was an appropriate subforum.
If you just want to simulate circuits, consider using
LTspice. Its a fully featured SPICE simulator (although with a somewhat clunky UI), freeware from Linear Technology (now part of Analog Devices), and is probably the most popular for sharing analog circuit ideas in electronics forums. Dave's done several EEVblog videos on it and there are a lot of topics about it here. There's also an active Yahoo user group.
It doesn't have cute virtual instruments to display stuff directly on your schematic, wont help you design or layout a PCB, and its facilities for simulating digital components are limited (simple gates simulated in analog domain - no MCUs etc.), but if you learn to use one traditional SPICE package like LTspice you'll have little difficulty adapting to any other.