Cannot delete folder in the C:\Temp

Checking disk I discovered a folder c:\Users\...\Temp\imgMnt01 with size 10Gb, see here:
http://i.imgur.com/rKWyNVK.jpg
It looks like the image of an entire disk Win7+C:, probably in conjunction with NTlite, I used a long time ago.
I suppose, if the Temp directory is not needed for running os.
But it is not delete in any way: no programs like Unlocker, or MoveOnBoot, etc. Even in safe mode.
I have admin rights, I am the only one on this PC.
What to do? I cannot find any procedure, consult someone with a similar experience?
Thanks for the advice
Peter

 

Use a bootable CD to delete it - a Linux live CD, or even command prompt in a Windows System Repair disk or installation disk should work. I find Puppy Linux very easy to use for file recovery and deletion.

 

Use CCleaner. Click Options > Include > Add and browse to that folder. Click OK and run CCleaner. You might have to restart your PC.

http://www.majorgeeks.com/files/details/ccleaner_standard.html