Hi Jovro and welcome to BC!
There are two ways you can try to do it.
1) Boot into Safe Mode
by continuously tapping the F8 key as soon as the computer begins to boot. A menu should come up where you will be given the option to enter Safe Mode. Then try to delete the file and see if it's possible.
If method 1 doesn't work, then try method 2.
2) You can get either Delete Doctor 2.1
to help you to delete the file.