What you will want to do is make a list of all the software you wish to install. Then go to the vender's website or google the product to find it. See if they have a Vista compatible version. If so, then download these software's if possible and burn everything to a CD or DVD.
Then, when you get your Vista computer (probably pre-installed), you will do the following
in this order1) Make sure Vista firewall is on.
2) Install your Antivirus, update it and make sure it is always running in the background, autoupdates, and loads at startup (Do NOT go on the internet until this is done).
3) Go to Windows update and get all the updates.
4) Install the latest Java Runtime, ver 6, update 1 (essential software to view many web pages).
5) Get Flashplayer & Shockwave Player. If you plan to install Firefox, I think, there's specific versions of these softwares for that browser.
6) Install all your security apps including Firewall (turn off Vista firewall, if you're going to use a 3rd party firewall), anti-spyware and standalone scanners like Ad-Aware, Spybot. Update them and run scans.
7) Install all your remaining Vista Compatible software.
8) Go through your hardware and see if there are any specific driver updates for your system. You can also do this through your computer manufacturer's website.
Take any negative reviews of Vista with a grain of salt....many of the complainers either have incompatible software, drivers, insufficient RAM or hardware or they are on the "learning curve" and are too impatient.
I remember when I went from Windows 3.1 to Windows 95. I hated 95 since it was so different than 3.1. However, after I got used to it, I loved it.