Cant delete things off R4i micro sd card

Ok, now I've done it. In my madness desperation to find a fix for SoulSilver I completely messed up my micro SD card. I deleted everything and when I tried to put it back on (since i backed it up) it said 1 hour xminutes. It quit responding and shutdown.THen there were remaining folders on it with all sorts of funky names i dont think I can even type. I tried to delete it but it says this:
"The file name you specified is not valid or too long. Specify a different file name."
Options below it: Try Again Skip CancelHelp please?

Try to right click and refresh....

oh, thank you Jesus.. I unplugged it, plugged it bnack in, came up and said files are corrupt run a scan. and it fixed it for me. NEvermind.

On a future note if you wanted to delete everything just right click and choose "format memory stick"....