Trouble in vista?

I'm having trouble playing the ds emulator No$gba in vista. I also have No$gba in my pc and it works well(if u dont mind the lag). So y cant i play No$gba in vista??? Also I'm trying to play FF tactics A2 and i downloaded it from the same site as i did in my pc.

try running no$gba as administrator.

If that doesn't work, just use a different emulator.