Shutting down when I run defrag on C drive (hard drive, Windows, restart)

[1coolcustomer]

I've never seen my puter do this one before. 3 times now when I try to run defrag on c, it shuts down and restarts. I've been forgetfull about the past 4 months and it hasn't been defragmented in that long.....help.

[harry chickpea]

Rule #1. When something unusual like this occurs, make a COMPLETE backup before doing anything else.

Rule # 2. See rule #1

You may have a drive that is going bad, especially if there are noises in the hard drive.

[skel1977]

Usually this is due to corrupt data on the hard drive. First step is to run check disk.

I would next run the system file checker to make sure that the files that comprise Windows itself are intact. Since the disk defragmenter is a part of Windows, if some component of this tool has been corrupted, this should repair it.

[MediocreButArrogant]

This could be a heat issue - when the disk is continuously seeking and read/writing, it consumes a lot more power, and therefore has to dissipate a lot more heat.