hmmmm, it could be a number of reasons, it could be the phone model, rom, or maybe u did something wrong on your comp, i didnt use my comp, i can do it strate off my phone, make sure you use wifi of course so u dont get charged for downloads via your 3g pay plan, i also use an anti virus on my phone, there are several different apps on the android market that will screen roms/files before downloading them, i would advise doing this before hand, all i can currently sudgest is try a different rom and do the whole process via your phone, infact your rom that you downloaded my be saved to the wrong file, i would advise downloading an app called astro, its a file manager that is fairly easy to use, maybe your rom isnt even saved to your sd card, some roms wont sync properly if you dont have the emulator saved in the same place as the rom, like i said make sure its a rar file and i would advise using either
www.roms4droid.com (hasnt got the greatest selection of psx roms but very reliable) or download an app called rom fetcher playstation, it has a massive range of games but there is a chance that it will be faulty.
let me know how you get on bro, feel free to ask for any more advise.
ps - check out slideme.org and look for yongzh's applications, his apps got banned from the android market but there going for free at this website, check it out while you have a chance.