Cannot defrag my computer since installing Windows 8.1?

Hello, I also have this problem. I will try your instructions.

It's not from the AV because I am using Bitdefender not Norton.

Hi Joe, Bitdefender has it's own defragger in the tuneup section so you may want to try that first. 

John

Hi Joe, Bitdefender has it's own defragger in the tuneup section so you may want to try that first. 

John

Hello, unfortunately I have Bitdefender Internet Security and not Total Security. I never thought I would need their defrag. Maybe I would need to try a 3rd party defrag program like AVG PC Tune Up?

And should I try the other steps provided in this topic?

Just try the 3rd party one like defraggler. I've found in the past that these PC Tuneup programs cans cause more problems than they are worth. You may find that once you defrag your drive with the 3rd party one that the Microsoft defrag program may work again like mine did.

I found a solution that worked for me here:

Strange Defrag error 0x80070057

http://social.technet.microsoft.com/Forums/en-US/6d782ade-f4de-43bf-8cea-647828b35757/strange-defrag-error-0x80070057?forum=winserverfiles

Open an Administrator command prompt and make use of fsutil:

fsutil usn deletejournal /D <volume pathname>

fsutil usn createjournal m=<max-value> a=<alloc-delta> <volume pathname>

Eg :

fsutil usn deletejournal /D C:

fsutil usn createjournal m=1000 a=100 C:

After using these commands I was able to defragment C: without an error showing up in the event viewer. I'm not sure if this is a permanent or temporary fix, and someone mentioned in that thread that it didn't work with a server so YMMV.