How to play playstation games in my computer?

do i need to download anything like emulator or something? i need some help. :(

Your best bet will be the emulator ePSXe.Check out this tutorial to get you started.
http://forum.romulation.net/index.php?topic=8528.0

Replying to #2

I don't know what's up with all the plugins. all you need is a BIOS and an emulator and your good to go. also, I recommend you get an Xbox controller for your PC. you can map the buttons on the ePSXe config. WAY better than playing it on a keyboard

For a beginner I recommend psxfin, you just pick your game and it starts, no messing about. Ignore lotlat, you need do need plugins and some games require different ones.