Well then Jaime you follow the instructions below and it will get deleted in next no time.
(The software recommended "UNLOCKER 1.9.0" is a freeware and is totally secure to download and install)
Download UNLOCKER 1.9.0 (google it and the first result is the download link mate) and install it.
After that right-click on that torrent and select "Unlocker",
this time you will get a small window of unlocker software asking you for some options. (No Action, Delete, Rename, Move)
Select "Delete" and press OK.
This will instantly delete the file and unlock all the handling programs using it.
If you still need more help on this just contact me via Yahoo IM "dragondoom2001"
Always here to provide instant troubleshooting ;-)