Problem installing 3.315 on MY Vista system

[MTUSUPPORT]

Ok,
We are making some progress today, just still not able to install yet.

We are finding it to be deep in our .dll file that Microsoft changed some call, that we were using, so far this is what it looks like. Problem is figuring out which one and how to fix it.

It was working fine, last week and no longer is this week, so something in Vista changed on the prebuilt computers.

As stated above, I have tested and it still works fine under my Vista Ultimate and Vista Home Basic installs, that I installed myself.

It will not work on the laptops we get from a laptop manufacturer, these are where the problem comes from this week.