please help.. xp destop icon disappear and appear again and again

Recently i installed autopatcher from digit's august edition which is "Autopatcher XP May 2007 core" after the complete installation it asked for reboot then i restart the computer. when it started this time it asked for the password but i never set the password so i clicked ok option (username was already there which is the administrator name) windows starts but the desktop is completely blank except the wallpaper then after 2 sec the icons appear normally and then again disappear and appear again and again.
what to do please help me.
i also try to system restore but the restoration point before today's date is not present. what to do please help me
and i cant format my pc as it contain my office data.