Help! I've just downloaded a virus or trojan. What do i do?

I downloaded a font file. Then when it wouldnt "install the font", I realized it might be malware. I immediately sent it to trash but when i try to empty the trash a window pops up that says "The operation can't be completed because the item FindetNemo.ttf is in use. The choices are skip, stop or continue". I've tried all three and cant get this file off. I've closed all programs, turned off the wifi & signed out of icloud drive so hopefully the virus can't see everything, which required deleting all contacts, calendars, etc. from my mac (bummer).

What do I do at this point? Is this a virus or trojan. Ive opened up my Activities Monitor and my computer seems to be very idele at this moment. System 0.21%, user 0.41%, idle 99.4%

This is a mac book pro using El Capitan 10.11.5

Thanks!

You may not have downloaded malware at all. I've had something like this happen once in a while even with data files I know are clean because I created them. I think what has happened is that the program which was processing the file did not "release" it properly when the installation failed. Normally, quiting the open program, rather than just closing the open window, does the trick but sometimes more action is needed; Try the following:

1. Log completely out of your Mac not just out of iCloud drive. Sometimes I restart the computer instead if it has been a long time since I've done so.
2. Now, when you log back into your Mac, try to delete the file. That should cure things.

If the file deletes but you are still concerned about malware, download and run Malwarebytes for Mac

Thanks for your reply/words of assurance. I did shut down completely and tried to empty the trash again. I got the same message. UGH! But i tried once more by control clicking. I had not seen the "Delete Immediately" choice before and that worked. Now, to put everything back together again. Thank you!

You're welcome. I never think to tell people about the delete immediately option. I always forget the key command for using it.

Just possibly for others reading this thread:

if you get the message "the item cannot be deleted because it is in use" or similar — highlight the item(s) in Trash; then Option + Cmd + Delete (backspace key) opens a little box or window saying "are you sure you want to delete?" with "Cancel" or "Yes" as options. Click "Yes".

This almost invariably works.

Ian