Ok, smashdude u caught me in a good mood, so I am going to help u give the right information so we can help (I'm helping u, help others, so they can help u, lol), if u choose to ignore my tip, don't expect help
first off, no such thing as a PC rom, roms can be played on any number of emulators, whether it be on your PC, your Wii, your psp, or your xbox.
The roms are specific to a console, there are nes roms, snes roms etc. So you can play snes roms on the wii, the pc, psp, etc. The roms are the same regardless of how u r running them
you need to tell people what system the rom u have is for... frogger alone doesn't tell us anything
Generally speaking, most emulators have a folder saved on the root of the device (named the same as the name of the emulator), inside this folder will be another folder called roms and/or saves. Roms get put in the rom folder (who woulda thunk it?).
Some emulators allow u to browse your drive for the rom, in which case they can be saved anywhere u like
above all else, F***ing search!! I've been following these forums for a LOOOONG time, and I haven't seen anyone else ask so many pointless questions... its getting to the point where people are seriously starting to question whether u are acting ignorant on purpose