Need Help with this SQL Report

Declare @Total int

Select 

	@Total=count(*)
 
From

	v_Add_Remove_Programs

Where

	v_Add_Remove_Programs.DisplayName0 Like '@DisplayName'

Select Distinct

	v_Add_Remove_Programs.DisplayName0 as [Software Product], 
	Version0 as [Version], 
	COUNT(v_GS_System.Name0) as [Count], 
	Round(100.0*count(*)/@Total,1) as [Percentage]

FROM 

	v_Add_Remove_Programs
	Join  
	v_GS_System ON v_Add_Remove_Programs.ResourceID = v_GS_System.ResourceID 

WHERE 

	v_Add_Remove_Programs.DisplayName0 Like '@DisplayName'

GROUP BY
  
	Version0, 
	v_Add_Remove_Programs.DisplayName0

ORDER BY 

	[Percentage] DESC
		

Select Distinct

	v_GS_SYSTEM.Name0 as [Computer Name],
	v_Add_Remove_Programs.DisplayName0 as [Software Product], 
	Version0 as [Version]

FROM 

	v_Add_Remove_Programs 
	Join  
	v_GS_SYSTEM ON v_Add_Remove_Programs.ResourceID = v_GS_SYSTEM.ResourceID 

WHERE 

	v_Add_Remove_Programs.DisplayName0 Like '@DisplayName'

GROUP BY
  
	v_GS_SYSTEM.Name0,
	Version0, 
	v_Add_Remove_Programs.DisplayName0

ORDER BY 

	[Version] DESC

If I remove the @DisplyaName variables and type in a product name sucha as:

= 'Microsoft Office Professional 2013" or something, it works fine. How can I get the @DisplayName variables to work for me?

Thanks