Customer brought me a Gateway NE56R13u laptop running win7 64 bit home premium. I’m trying to run a chkdsk /r on it. When I attach it as a secondary drive, first it says that it must dismount the drive. I reply 'yes'. Then it almost immediately says that chkdsk has stopped working. So I booted to the Win7 installation disk. I went to a command prompt and tried to run the chkdsk there. It said that it had to dismount the drive, I replied ‘yes’, but after the dismount it doesn’t begin the chkdsk but goes right back to the C: prompt. What would cause chkdsk not to work?