Google for FTP transfer via VB.NET since I can't be bothered typing it out and I can't think of it exactly off the top of my head. I guess screen capture would be on a timer tick event with the correct interval for the user inputted time and would have something like:
[php]
//do a screen capture however you feel most suited
Dim TheScreen As New Bitmap(My.Computer.Clipboard.GetImage)
TheScreen.Save(Application.StartupPath & "\image1.bmp")
[/php]
And then just upload that to a FTP. I dunno lol.