windows xp sp3 not signing-in to SKYPE --- -solved

                        Old type pcs which are using windows xp  are now a days won't work for skype. so best solution  for this is
                              (i) install service pack3
                             (ii) Install Internet Explorer 8.0
                            (iii) install latest SKYPE software

                       Now it works well......enjoy with skype video calling.