Why my PC hangs during file transfer?Please help

Hi guys,
I'm Juan want to ask a question that I'm seeing this problem from few days working with my PC.The problem is my PC hangs during file transfers be it any file and n kind of transfer.I tried copying files from DVD and my SD card too, but the problem is same I'm unable to transfer any file please help me solve this I really need to copy some files.
Thanks in advance.
Juan
