Microsoft Word - Which runtime for Word 2007 vsto addin .Net 4.0?

Hi all, 

I created a APPLICATION LEVEL plugin for Word 2007, .Net Framework 4.0. 
I searched online and it's pretty confusing for me on which runtime could be used for it if I want my plugin to be able to run on word 2007 and 2010 word on client PC.

It will be great if you could provide links that explain which runtime is for my case.
Thanks!

I seen http://en.wikipedia.org/wiki/Visual_Studio_Tools_for_Office , a table that shows run time etc... 
So does that means that VSTO2005 SE , VSTO3.0 , VSTO 4.0 run time will work for client PC that has office 2007/2010 installed? Or only vsto4.0(since my plugin is .NET 4.0) runtime able to run for both 2007 and 2010 plugin?

here is the LINK to download

and how to install LINK

hope it helps
Regards
D

thanks for the fast reply, D.. 

How do I know which OTHER run time could be used too?
I will like to find out all other possibilities too!

welcome. microsoft provides there products details like.......vesion detail,compatibility and all in download links u can see this