VB Script to check for Microsoft Office 2003 and Word 2007

I had written this script to check the presence of MS Office 2003 and Word 2007 on a machine before proceeding for installation. Here is the code:

officepath11= sProgramFilesDir & "\Microsoft Office\Office11\"
officepath12= sProgramFilesDir & "\Microsoft Office\Office12\"

'set File System Object
set fso=createobject("scripting.filesystemobject")

'Check if file exists for Office 2003 and if yes then its version
path11 = fso.GetAbsolutePathName("C:\Program Files (x86)\Microsoft Office\Office11\winword.exe")

if (fso.FileExists(path11)) then
returnstring11=fso.getfileversion(officepath11 & "winword.exe")
else
returnstring11="Null"
end if

'Check if file exists for Word 2007 and if yes then its version
path12 = fso.GetAbsolutePathName("C:\Program Files (x86)\Microsoft Office\Office12\winword.exe")

if (fso.FileExists(path12)) then
returnstring12=fso.getfileversion(officepath12 & "winword.exe")
else
returnstring12="Null"
end if


arr11=split(returnstring11,".")
arr12=split(returnstring12,".")

if (arr11(0)="11" AND arr12(0)="12") then
'msgbox "Office 2003 and word 2007 both are installed, continue with script below"
else
if (arr11(0)="11" AND arr12(0)="Null") then
msgbox "Please install Word 2007 before installing this application"
WScript.Quit
else
if (arr11(0)="Null" AND arr12(0)="12") then
msgbox "Please install Office 2003 before installing this application"
WScript.Quit
else
if (arr11(0)="Null" AND arr12(0)="Null") then
msgbox "Please install Office 2003 and Word 2007 before installing this application"
WScript.Quit
end if
end if
end if
end if

set fso=nothing