Emptying trash and keep getting cannot delete file in use message?

Driving me nutz, how do you work around this? irritating the heck out of me, one file i downloaded was cyberduck for ssh with iphone but got the an older one and all it does is crash, trash bin'd it and keep getting that message but nothing shows in activity monitor... this happens with so many things i trash that when I search they are not in use????

Also that stupid cyberduck widget is still stuck in dashboard even though I took it out of the library folder for widgets.... ughh

Got it now, forgot to check top of finder when in it. How do I get rid of the cyberduck widget though? Its in dashboard and I deleted the file from library widgets as thats what it said online too do.... but that didn't do anything.