They should always be. But, try The Emulator Zone website, it's easy to use, always updated, free as it should be, and safe to download from.
u can search on google free no@gba emulator after that search on youtube how to use it
Downloading with 100% safety is not possible but the Emulator-Zone is a good place.
there are many sites, no$gba its actually best nds emulator, try version 2.6a
Around £12-£15 pounds, depending on style and colour
One of the best GBA emulators on the market is called No$GBA it is highly ranked. It is advertised to be able to play many types of games on this one emulator.
you can. you just have to download vbalink and open two emulators and go into the options and click on link
You can get all the emulators at http://emulator-zone.com/doc.php/nds/ But I recomend NO$GBA because it is the best one and I have it too.
well go to gameshark.com and get the codes for the game you liek
In Emulators you can't fix the corrupted Data, Just in the GBA or GBA Sp
Every one is different. Be more specific on what emulator.
windows, an emulator, and roms, internet browser
yes they are free and you can get them by searching on google