error pressing key programmatically

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C#

error-handling

event

Hi
i have C# application and an embedded browser in it,it's task is to go to my web site and right click on a link and press 'r' so the properties window appear(i move the mouse with code) it works on my laptop perfectly but when i install it on my pc or any other device when the program does this command:

SendKeys.Send("r");

i start to see and error telling me : Unhandled exeption in your application.the requestetd resource is in use.(Exeption from HRESULT:0x800700AA)

here is my code which works on my laptop

int x = getXoffset(link);
int y = getYoffset(link);
webBrowser1.Document.Window.ScrollTo(x, y);
Linker.Win32.POINT p2 = new Linker.Win32.POINT();
webBrowser1.Focus();
p2.x = webBrowser1.Left + 10;
p2.y = webBrowser1.Top + 10;
Linker.Win32.ClientToScreen(this.Handle, ref p2);
Linker.Win32.SetCursorPos(p2.x, p2.y);
MouseOperations.GetCursorPosition();
MouseOperations.MouseEvent(MouseOperations.MouseEventFlags.LeftDown);
MouseOperations.MouseEvent(MouseOperations.MouseEventFlags.RightDown);
MouseOperations.MouseEvent(MouseOperations.MouseEventFlags.RightUp);
SendKeys.Send("r");

what should i do?what even this error means?

Tanx