My SD card is messed :'( The games don't work!

I REALLY need a new game, but the card is messed! It keeps saying "Cannot read the data. Please re-insert the ds card" Did this happen to anyone before?
If so How can I fix it? I am very scared and worried :'( :'( :'( :'( ??? :(

Try reïnstalling everything (but keep the save files ;) )
This is the most common solution.Edit:
Also, this is the wrong thread.

I would but my brother is a hog on the computer, and I don't know ANYTHING about how to do that =(

Opps, but the games I download don't seem to work.

Please read the [rules]. Double posting is prohibited.

Did you unzip them?Also does your computer read the sd card when you put it into the computer?