also try run/install them as administrator (right click, run as administrator)

how do i get to the instlation directory

better yet, turn off UAC altogether then try install the games

Vista Vista Vista Vista Vista!!!

I'll take your vista and raise you xp :P

now i cant open the disc drive, i fixed this by restarting the computer

please insert the correct dvd rom select ok and restart application

rome is working ,i used the compatibity mode thing

http://www.thinktechno.com/2007/03/13/list-of-vista-compatible-games/

Zoo tycoon listed

It SHOULD work, its listed as compatible.

reinstall it as adminstrator - its under compatibility so do compatibility on the setup file on the cdrom - right click go explore files, then right click on the file named setup and click XP mode and administrator rights.

Otherwise go to the compatibility wizard in Vista under help.

If you still have your CD key, you can download steam, make an account, and choose games-->activate a product (or something like that). Enter your Half Life CD key here, and you'll get access to the steam versions.

If it still doesn't run, right click on the game and choose properties. In the general tab, click on "set launch options" and add "-d3d" without the quotes, which forces it into direct3d mode (opengl is default).  You also might even be able to do this without steam, by running or making a shortcut with the path to the .exe along with "-d3d".