VS 2008 SetScrollInfo And GetScrollInfo Not Working On 64bit Os?

I'm using Windows 7 and I built a small application that just moves the scrollbar of the current active window to some value.The problem is that nothing happens. I tried using GetScrollInfo too but I only got 0 in the nPos parameter.

This is my declartions and constants:

Private Declare Function GetForegroundWindow Lib "user32" Alias "GetForegroundWindow" () As IntPtr
Private Declare Auto Function SetScrollInfo Lib "user32" (ByVal hWnd As IntPtr, ByVal fnBar As ScrollBarDirection, ByRef lpsi As SCROLLINFO, ByVal bRepaint As Boolean) As Integer

[code]....

On the form load I just do a delay of 2000 milliseconds so I could focus on another window, wait and nothing happens.

System.Threading.Thread.Sleep(2000)
My.Application.DoEvents()
ScrollCurrentWindow()