Adding prerequisites to setup project VS2010

I want to add new prerequisites to my visual studio setup project. Searching, I found the "boot开发者_运维技巧strapper manifest generator" that looks very nice, but the problem is that it doesn't work well on 64bits (the checks that it does doesnt work (I check it trying it in 32 bits pc and 64)).

The thing is that i have to install a package first if the SO is 64 bits. How can i do it?