Long Black screen during startup (no cursor)

Hello, I recently upgraded my dell 1645 from windows 7 to 8. I installed most of the drivers from the dell website even though they were meants for win 7. For some of them I installed drivers directly from the device manufacturers website. When the computer first starts up it passes the windows logo, and then a black screen is shown (no cursor) for a good 5 minutes. Then it advances to...