PSX Emulator for WindowsOverview
Connectix Virtual Game Station was a popular PSX emulator back in the day. It ran fairly accurately on low spec machines and thus attracted the ire of Sony. Eventually Sony ended up suing the company that produced the emulator, however Sony lost the lawsuit. This is the emulator and also includes a special patch which allows you to play at resolutions higher than 640x480. However, it does not enhance the graphics in any way.