Verified answer

The "drag" program is part of widnows shell I believe (part of the operating system). So your operating system is becoming corrupt. Your hard drive is probably old and the disk surface may be wearing away. From the link, do post #3 first, then post #2. The most important parts are the checkdisk and the Windows System File checker or the recovery console's repair method. Back up anything important from the comptuer as the hard drive is starting to die.