DSTT problem

Hey guys help me please !!!I have a DSTT with 1.1712 firmware. And when i put roms on my card sometimes the card is making files on its own ... files i didn't put on my card.
Then all Roms don't work and they wont load. The i copy all games on my computer, then i format the card. And geus what there gone. but this is the 3rd time in a week and its really anoing so please help. the files he makes on his own are strange files/names this is what i get :- \U^S[[~1._EW (128 mb)
- ´umino~1.nds (0 kb)
- ¸qymaoy.nds (96 mb)
- §769-W~1._EW (128mg)
- §777-S~1._EW (32,5 mb)
- 5775-P~1._EW (32,5 mb)the file size is difrent to and when i look at my card the files dont take any space, its really strange. please help.

it looks like youre files are corrupted!

no because i don't miss any files. everything is the way it was only those files prevent me from loading Roms.... O no ... my Legend of Zelda Spirit Tracks sav is gone :( the .nds file is still there now i have to start all over again :( :( :(

Backup what files you can, and format your MicroSD using this:
http://www.sdcard.org/consumers/formatter/Corrupted data on your card, or a card that is starting to corrupt, sometimes starts showing weird files on it.