Kill the task sequence window
There are a few blogposts about moving the task sequence status window.
An easy way is to simply kill it. 
A short VBScript-hack:
killProcess "TSprogressUI.exe"
Sub killProcess(sProcessToKill)
Dim oProcesses, oProcess, oWMIService
Set oWMIService = GetObject("winmgmts:\\.\root\CIMV2")
Set oProcesses = oWMIService.ExecQuery("Select * from Win32_Process Where Name = ‘" & sProcessToKill & "’")
For Each oProcess in oProcesses
oProcess.Terminate()
Next
End Sub
Some other ways:
http://blogs.technet.com/deploymentguys/archive/2008/10/09/placing-your-window-on-top-during-the-windowspe-stage.aspx
