I had a problem with very slow bootup with a new aspire after deleting the trial software and updating the desktop background. After numerous attempts including restoring to factory settings it turned out that the pc did not like an SD card in the slot during booting. The fact that the card contained the jpg file used for the desktop may be relevant. Anyway took the card out of the slot and all has been well subsequently. Moral of story don't boot with a card in the slot.