PCSX2 is what you need. You can usually torrent a package online that included the emulator, BIOS and some other things that works well with the emulator. The emulator is a bit outdated with the last official release being last year, but you can try to find the build bot version of it, which is much more recent. I play mine with Dual Shock 4 coupled with DS4Windows software, and it works fantastic. The emulator is a CPU intensive though, and some games can be a bit of a pain to run, like Metal Gear Solid 3 Subsistence for example. The framerate slowed to a crawl when fighting Fury. But i've played other games that run really well like Shin Megami Tensei 3 Nocturnal.