Hi there,
Recently installed the Home version, ran a boot time scan after the first restart and havent been able to logn ever since.
Every time I get past the logon screen, I am shown a glimpse of the desktop and then tossed out.
I did try the suggestions posted by others - logging on in the safe mode and working the miracles but :(, I get the same reaction as with a normal boot.
Help…
Probably you have deleted (or moved to Chest) a necessary file to boot… 
Maybe overinstallation can solve the problem and you won’t lose your programs, settings, data, files, etc.
Just choose ‘Repair’ installation of Windows and install ‘over’ the old installation.
http://support.microsoft.com/default.aspx?scid=kb;EN-US;315341
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q314058
http://support.microsoft.com/?scid=kb%3Ben-us%3B315341&x=15&y=0
http://www.microsoft.com/windowsxp/using/helpandsupport/learnmore/tips/doug92.mspx