R4 SDHC JPEG fail

Ohai guys! It's time to ask my first official question...
Well, I have a R4 SDHC and, to make use of the SDHC compatibility, I have an 8 gig micro SD in it. Well, some of the .jpg pictures I have in the thing work, and some don't. The one's that don't work don't just not work, however, when I go to the folder with these pictures, everything seems to be some weird random characters and my /... dosen't work (the up folder button). Both the games selection and using moonshell have this problem and, of course, I can't open the pictures. Also, if I had say 50 pictures, I'd only see about 6 weird thingies on the screen.Thanks in advanced ^.^EDIT:It seems it's EVERYTHING I put into the R4 that's not a .nds file will come up as gibberish when trying to open it on my DS, but will be fine when opening it on any computer. It worked for a while, but now everything seems to be messing up. I can't really think of any explanations on why this may be, because the same adapter is being used on the same computer as when the files that DO work were put on. Anyone have any advice or tips? thanks in advance!

Backup and format, and use check disk for errors.

hello there, i have problems with starting up any game for the ds lite on a micro sd card. what can be the problem? please help.

What flashcart, what problems do you have? You can't load them? Have you extracted them?

What he said. First of all, it should be ending in a nds file, if it dosen't and it ends in a .rar or .zip then download and install winrar. Other than that, make sure you get the system files! No flash card works fresh out of the box! Look up the name of your card and get the basic files for it.EDIT: I tried what Anandjones said, but it didn't work! Now DIFFERENT files woln't work on my DS, but everything works fine on my PC. What's going on?EDIT EDIT: I tried what Anandjones said and my game files are all now CORRUPT!!!

Did you backup first and then format?

Yes. D:
I saved everything from the card to a folder, formatted my disk, error checked it, put the files back on, and disk defraged. Some of the files that were orignally corrupt wern't and many files that wern't orignally corrupt were, including many files in my game folder. I tried recopying the games folder over, but no luck.Also, as I've said before, all of these files are fine, or seem to be fine (the only one's I can check in depth are the .jpg's, which work fine) when looking on the PC. On the NDS however it goes all weird.

You'll probably have to get another MicroSD if nothing else is working.