ActiveX or Java program to collect system/hardware information
 

I'm looking for a way to collect hardware/software information from users that visit a site I'm working on (The user will request this action with full knowledge of what is happening of course). You can see an example of what I'm looking for at Crucial where they have a button to click that checks if your pc is ready to upgrade to Vista or not.

I've looked around but can't seem to find any pre-packaged solutions. Does anyone know of anything like this that can be licensed or bought?

Thanks.