ALTER VIEW/Stored Procedure Problem

I'm getting a "Syntax Error Near Keyword View" Error when I check the syntax of this Stored Procedure.  Can anyone tell me why?  Thank you so much!

Brian

CREATE PROCEDURE spGenerateReportData

      @StartTimeWindow DATETIME,
      @EndTimeWindow DATETIME,
      @Line varChar,
      @LineStatus varChar,
      @CauseType varChar,
      @Shift varChar,
      @Team varChar,
      @Lot varChar,
      @Product varChar

AS
BEGIN
IF EXISTS (SELECT NAME FROM objSystems WHERE NAME = 'qrySearchCriteria1')
ALTER VIEW qrySearchCriteria1 (Process_Area, Machine, Unit_Op, Auto_Cause, Occurrences)
      AS
      SELECT Process_Area, Machine, Unit_Op, Auto_Cause, Count(Start_Time) AS Occurrences
      FROM qrytblMachineDT
      WHERE (Start_DateTime > @StartTimeWindow) AND (Start_DateTime <= @EndTimeWindow)
      AND (Line IN (@Line)) AND (Line_Status IN (@LineStatus)) AND (Cause_Type IN (@CauseType))
      AND (Shift IN (@Shift)) AND (Team IN (@Team)) AND (Lot IN (@Lot)) AND (Product IN (@Product))
      GROUP BY Process_Area, Machine, Unit_Op, Auto_Cause
END