mac doesn't close programs

Sometimes mac mail will not close down, have to force quit.

Often times when mac is booted, programs that were last open (and closed before shut down) re-open to point they were at before they were closed to shut down. Safari will start at last page visited, even if I go to homepage before exiting.

Any advice on what to do to correct problem? Running Osx 10.7.5

Thx., 6dreamweavers