R4 freezing/Pokemon Platinum problem

I didn't see this problem anywhere so I'll start a new topic.I downloaded Pokemon Platinum and put it on my R4. The game booted up fine until I turned it off. Now when I start the R4 up, it freezes at the "Loading..." screen. (Can't even get to the menu). Also, it seems that all the folders in the system folder have been named in Chinese and Korean, turned undeletable, and are around 3gb to 5gb big. 0.oMy sister's R4 runs perfectly, but Platinum is NOT in her's. Help please?

https://www.romulation.org/forum/index.php?topic=1462.0 Try running chkdsk (rightclick, Properties)

I'm almost positive positive that it's corrupted now; it won't defragment or anything, and instead says it's corrupted. I tried running chkdsk, but it wouldn't work, instead giving me this message:The type of the file system is NTFS.
Cannot lock current drive.Chkdsk cannot run because the volume is in use by another process. Would you like to schedule this volume to be checked the next time the system restarts? <Y/N>And then I get the End Program popup. I couldn't see anything else in your common issues thread that could help.

you have the same proplem like mine.what i do is that i make a back-up file.then i format my SD.after that my SD is alive and kicking back XD

Format the SD? How? :3

Right click, Format.