Make sure that you are only posting tips about Win 7 and/or solutions to particular issues you run into.
I would like to start by telling you how to get to the "profile" folder for COD:WAW so that you can restore your profile after you upgrade from Vista, XP, or whatever. First, make sure you back up your profile in the first place. To be safe, make sure you save it to a different drive, USB stick, or disk of some sort. You can get the backup tool here

After you install Win 7 and update all your drivers (make sure you do this for your sound, video, mobo, mouse, keyboard, etc.) you can then install your game and your patches. When you run your game, enter your game name. That will create the necessary folder for your profile. The folder can be found here C:\Users\Username\AppData\Local\Activision\CoDWaW\players. You have to make sure that you set your system to show you hidden. The fast way to do that is just to type in "Folder Options" into "Search Programs and Files" on your Start button. Then you just press "enter", click on "view", and click next to "Show hidden files and folders". Then you can copy your saved profile and just dump it into the above folder.
I also found that the game only works if you install it via the express setting in the default location. When I changed the default location of the install folder (I wanted it it on my D drive so that it would not be on the same drive as Windows) it would not launch. This happened with both COD:WAW and COD:MW, but I had no problems with MOH:Airborne. The only way I could fix it is to uninstall and reinstall the standard way.
Control Panel Tip
If you are like me and you tend to play around a lot with your comp's settings, you may want to pin the Control Panel to your taksbar. All you have to do is open it, right click on it in the taskbar, and click on Pin... Now you have quick access to all the goodness that is the Control Panel.