Update: Sorry for such a silly question :p This question was written in a hurry.
This is the whole background story: I was trying to download two parts of a .rar file using IDM from a file hosting server called downloadani.me. The first file was downloaded without any problem, but when the second one was 100% complete and IDM was putting all downloaded pieces into one, I received an error message saying something like: “Cannot rename ______.part2.rar from C:/———to D:/———-. Element not found”. Then it seemed, for some mysterious reason, that the part1 file was corrupted as well and it stayed there in my computer no matter what I did to delete it (restarted, used Unlocker…). I was so scared that my parents would put the blame on me (this computer was used by all member of my family, and that file was rather large) that I immediately got here and seek help from you all. It was almost midnight and I had to go to bed, explaining why the question is so brief :p
A few minutes ago I’ve figured out the problem. I tried downloading the file again and went to the C:/ location the error message pointed out. I deleted the download data of the files and now I can say goodbye to them :)
Anyway thanks for all your answers :)