Ok here is my quick 10 minute version of a vbscript.
Save the following as checker.vbs and have your client download and run it. It will display either that they meet the requirements or they don't. This only works on windows.
Code:strComputer = "."
Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2")
net = 0
java = 0
Set colItems = objWMIService.ExecQuery("Select Name, Version from Win32_Product Where Name Like 'Microsoft .NET Framework%'")
For Each objItem in colItems
If objItem.Version >= "2" Then
net = 1
End If
Next
Set colItems = objWMIService.ExecQuery("Select Name, Version from Win32_Product Where Name Like 'Java%'")
For Each objItem in colItems
If objItem.Name <> "Java Auto Updater" Then
If objItem.Version >= "1.5" Then
java = 1
End If
End If
Next
If net = 1 Or java = 1 Then
Wscript.Echo "You meet the minimum requirements!"
Else
Wscript.Echo "You DO NOT meet the minimum requirements"
End If