m3 problems, please help

Im starting to have problems with my m3 so let me start from the beginning.

I bough an m3 and everything was fine. Thn i found out about emulation so i put the nes,gb,sms,smd on it. It all worked fine still.
I transfered the files to my brohers house. and deleted them off mycomputer and my ds.
Next i bought a 1 gb sd card just for emulation and other stuff i could find out. So i redownloaded the stuff, put it on the sd card along with the files on the 2gb card.
But it wouldnt work. whch i thought was weird. Its also now not working on my original 2gb sd card. I tried donloading the dldi and running it etc, its stil not loading up any games. The original downloads work on my bros m3 real fine but even the original downloads dont work on my m3 simply. Anyone know what could be wrong. BE AWARE I AM A MASSIVE NOOB AT ALL THIS STUFF SO I WILL SEEM PRETTY DUMB.


Also whenplaying pokemon pinball on lameboy it freezes and restes ever minute or 2 wha can i do bout that ???

One last thing isit possible to play 2 player games such as streets of rage.
Or even trade pokemon on red/blue