Can't put files on my mem card...

Ok, so I have a 4gb sdhc card that I'm using for my R4i sdhc...When I try to copy files onto it I get "Cannot copy 'FILE': The file directory is corrupted and unreadable."So I removed all my files and tried to format it and got "You do not have significant rights to preform this operation."Any help?

Try a different MicroSD adapter, and check your adapter for any Lock switches that might be on.Try this formatting program.
http://www.sdcard.org/consumers/formatter/

It's not the adapter, I've tried 3.I'll try that program and see if it does it.Thanks for the replyEDIT: Thanks, it's working properly now.