Report to show number of clients with/without specific software with %

Question

I'm creating a report that shows 4 columns, AD Site, Visio installed, Visio not installed, % Installed. I can get all column right except 'Visio not installed':
IF object_id('tempdb..#tmp') is not null Drop table #tmp
select vrs.AD_Site_Name0, 
       CASE WHEN arp.DisplayName0 like '%Visio%'
            THEN 1
            else 0
       END as Visio,
       CASE WHEN arp.DisplayName0 not like '%Visio%'
THEN 1
else 0
END as NoVisio
into #Tmp
from v_R_System vrs
inner join v_GS_SYSTEM_ENCLOSURE enc on enc.ResourceID = vrs.ResourceID
where 
 enc.ChassisTypes0 in ('8', '9', '10', '14')
select  AD_Site_Name0 AS 'AD Site'
           ,sum(Visio) as [Visio Installed]
            ,sum(NoVisio) as [Visio not Installed]
    ,(sum(Visio)*100 / (sum(Visio) + sum(NoVisio)) ) AS '%'
from #Tmp
group by AD_Site_Name0
Any ideas what went wrong? Or is there any other ways to get the result I want? 
Many thanks. 

Answer 1

Awesome! This is exactly what I'm looking for. Thank you Sherry!
Nick, we have the same result. I would just exclude every irrelevant entries
Select DISTINCT DisplayName0 FROM v_Add_Remove_Programs WHERE DisplayName0 Like 'Microsoft Office Visio%'
and DisplayName0 not like '%Visio Language Pack%' and DisplayName0 not like '%Visio Viewer%'
etc...