Problems Copying files to MicroSD card

Hello,I recently got a R4 card for my DSlite. I'm having some trouble copying files to the MicroSD though. After multiple tries I was able to get the firmware on there. I put it in my DS to see if the R4 worked, and it did. I took the MicroSD out, put it back in the USB reader, and tried to put a game on there.The "Copy File" comes up, but doesn't actually copy. A sound plays indicating that a USB device has been unplugged/plugged, and a message pops up saying it couldn't copy because the device had been removed.

use a different card reader

Does anyone have a good card reader they would recommend?

I use this:
http://www.amazon.com/Targus-Flash-Memory-Reader-TGR-CRD25/dp/B000FPM7JW/ref=sr_1_1?ie=UTF8&s=electronics&qid=1264036351&sr=8-1Just because that's what my local electronics store had. But it requires an SD adapter for your MicroSD. Like this:
http://www.amazon.com/Sandisk-MicroSD-MicroSDHC-SD-Adapter/dp/B001GGL7Z4/ref=sr_1_1?ie=UTF8&s=electronics&qid=1264036442&sr=1-1It works pretty well. I didn't pay 25 dollars for it though... more like 12 dollars at Wal-Mart.

plug the cardreader and wait, until every activity of the pc is gone - so your shure your pc managed configuring the new device. after that, start copying.....