crack11.exe = virus?

[AzureD]

Hello, I downloaded crack11.exe a no cd crack for Mafia 1.1.
After running the crack, I tried to delete it but it said that the file is in use. So i reboot my computer and tried to delete it again but still having the same error. The only way i can delete the file is by going to safe mode. I re-downloaded the file just to make sure, and extracted it. This time i did not run it but again I can't delete it. Could you tell me if this is a virus or backdoor?