I'm not sure it's the apps. I think what actually happens is that Vista puts up a login prompt well before it has truly finished booting. i.e. before all the services have started.
The result is that you can login but the machine runs like a dog with no legs for the next 5 minutes as it tries to complete the boot process and deal with you trying to use it all at once.
"Dumbledore is gay," adding he was smitten with rival Gellert Grindelwald, who he beat in a battle between good and bad wizards long ago. The audience gasped, then applauded. "I would have told you earlier if I knew it would make you so happy," she said.
"'Tis true, 'tis pity, and pity 'tis 'tis true." -- Poloniouius, in Willie the Shake's _Hamlet, Prince of Darkness_