install the iso image (called when converted from cd format to some iso,img,cue,etc. modes).
this is actually software to run ps1 games on pc.
this following link is to download cd image first. it's .rar file.
[SCUS-94588]/45816-download"]http://www.emuparadise.org/SonyPlaystation_-DemosISOs/Gran_Turismo_2_Bonus_PlayStation_Disc_[U]_[SCUS-94588]/45816-download
after downloading file, then download the software. link is following.
http://www.filestube.com/27dea1720710781a03ea,g/ePSXe-v1-7-0-%5BComplete-BIOS-Plugins%5D.html
after that followink link will appear, wait for processing. and click the .7z extension (compatible with win.rar), file.
ePSXe v1.7.0 [Complete BIOS + Plugins].7z
when installed following picture will occur.

then you have a settings to do as per your compatibility of graphics.
then enter the right bios
then configure cd image runner
then it will be ready to play,
you can also get saved games, on following link, you have completed games available, no huslte of collecting money to buy cars ...
Gran Turismo 2 Save Game Files for PlayStation - GameFAQs
have fun if something there will be on my part, i'm eager to help. 
new save files have also be configured when changed/swaped.