Receiving errors on a memory stick used for an HP Ipaq

Hi guys, great site and very informative. I need a little bit of help though. I've got an SanDisk memory card that I use for my HP Ipaq. I am constantly adding and removing data from it and it seems I have some files that just don't want to go.

Here is a picture of the message I get when it try to delete these files:

http://img210.exs.cx/img210/5299/error1zn.jpg

I've tried booting in safe mode and doing it. I checked to see if I could defrag it but the defrag utility didn't pick up the drive in the ipaq. I'm at a loss, hopefully someone can help me out/

 

you could try copying the files into a folder on your desktop and then try and delete them if that works cut them into there and do it again.
or move all your folders + files that you want to keep and leave those you dont then format the card