President Bush's last-minute address to the nation is wreaking havoc on the networks' prime-time schedules. The speech  slated to begin Thursday night at 9 pm/ET and last 30-45 minutes  has forced Fox to preempt the second episode of Reunion, which will now air Sept. 22. Also, CBS has rescheduled tomorrow night's repeat of the Quentin Tarantino-helmed two-hour season finale of CSI for next Wednesday, in place of the planned season premiere of CSI: NYGary Sinise and Co. will now return on Sept. 28.