Unable to delete Bukkit

Ok, To Start my Keyboard is stufing up.(not to dowith troubke)
So i was doing some maintenc on my sever an whn i accidently clicked on the jar ile and now i cant get rid of it coz it says its in use because clicked it. so now i cant use the serverwith the normal port and its very lagy now.
Theres 2 files that go with it
he jar it self and server.log.lck
please help!

 

Try restarting your computer and try again. the java process is probably still loaded into memory and it needs to be killed.

i'm guessing you're running windows?

 

yes i am!
Ill try that

 

or you can open task manager and end process "javach" or "javaw" something like that.

 

yea, i had the same problem, i just restarted my comp and it worked