Help with Windows XP! Always in 32/64bit or Safe Mode, stuck!?

It may have corrupted your user file. Try this. Go to the user applet in the control panel and create a new user account. Log off your old account and then logon to the new account and log on. If the computer works normally in the new user account transfer your files to the new account. If you are an ITunes user make sure you transfer the entire ITunes folder (from My Music) not just the songs