I have two card readers/writers. I have an SD card to read/write. When I plug either reader/writer into the usb. It shows up with my card and whats on it. Thats fine. However as soon as I try to delete anything from the card - my whole computer freezes and my mouse goes onto an hour glass and stays like that. I usually have to shut down the process of the removable drive that it comes under. Both readers produce the same result so I have deduced that it must be my computer. I am running XP and have quite a bit of software on the computer however I have a 53GB free on the hard drive and I own 512mb ram which I believe only 200 or so is taken up.