Can't logon to windows even in safemode

When i switch on my desktop, i noticed that the view of logging onto windows xp admistrator was changed. I logged in to the windows as adminstrator, but i was shocked seeing no icons, no taskbar, nothing was there even alt+ctrl+del was not working and i was again shocked, seeing it returning to logon to administrator. I again logged in but the same repeated. Even it showed the same in safemode too.. Plz anybody help me.. I was strugling here...