I've run into this problem myself. America's Army apparently hates Vista.

Essentialy the User Accont Controller isn't letting the installer run as administrator.

Here's what I did to get around it.
Open the context menu on the command prompt, and "run as administrator".

then run msiexec /i "America's Army.msi" from whatever location you have that file stored.

http://forum.americasarmy.com/viewtopic.php?t=248540

Note that you might need to be running as an admin to play.

The answer is in Sengoku's last post.

That is you need to be in the folder or directory that the install is in when you use the command.

The way I would do it would be to move the installer file to your root folder (C: ) and open a command window. Start>Run> CMD for XP don't know about Vista. Type "cd \" (without the quotes) and hit enter. Then type the command, msiexec /i "America's Army.msi" . Otherwise you would have to navigate in the command line to the directory where the installer is.

I believe you would put where the file is saved before you put America's Army. If you where using windows xp this is how it would look and it was in your documents "msiexec /i C:\Documents and Settings\"username"\My Documents\America's Army.msi"

you of course would put your user name, I'm pretty sure this is what your supposed to do.

Any more idea's man?

This is killing me lol

And anyone got msn i can add?

For 1 to 1 help lol

At the compatibility tab, select the checkbox that says "Run this program in compatibility mode for:" and in the scrolldown menu, select Windows XP Service Pack 2. At the privelege level, select the checkbox beside "run this program as an administrator". This works, and it's how I got mine to work.

yes it really works dude just right click on setup go to properties and compatabilty tab and keep run as admin enable.dont run it manually run setup using games auto run mode.this will make u run aa in vista enjoy!!!!!!!!!!