Defrag wont complete

[PiKe]

Trying to defrag drive D: which has a fair bit on it, but plenty of free space (20%) I'm getting the following:

Volume (D
Volume size = 145 GB
Cluster size = 4 KB
Used space = 116 GB
Free space = 29.15 GB
Percent free space = 20 %

Volume fragmentation
Total fragmentation = 25 %
File fragmentation = 50 %
Free space fragmentation = 0 %

File fragmentation
Total files = 5,136
Average file size = 25 MB
Total fragmented files = 173
Total excess fragments = 242,881
Average fragments per file = 48.28

I can't reboot in safe mode because the machine is headless, so what options do I have?

 

[PiKe]

As the drive is labled as D: I'm assuming that it isn't the drive with windows on, right?

Correct.