Code:

function KillDll(aDllName: string): Boolean;

var

hDLL: THandle;

aName: array[0..10] of char;

FoundDLL: Boolean;

begin

StrPCopy(aName, aDllName);

FoundDLL := False;

repeat

   hDLL := GetModuleHandle(aName);

   if hDLL = 0 then

     Break;

   FoundDLL := True;

   FreeLibrary(hDLL);

until False;

if FoundDLL then

   MessageDlg('Success!', mtInformation, [mbOK], 0)

else

   MessageDlg('DLL not found!', mtInformation, [mbOK], 0);

end;