Just looked up this on Gog to see if they had it and not only is it currently on sale but this one comes with the expansion pack - which when I was playing TA : Kingdoms many moons ago I didn't even realise existed!
Aaahh remember when extra content released after the original game was WORTH buying? Remember when it added something more to the game than a couple of extra guns and an extra car? Remember when there was no lame unit limit and you could defend your glorious structure with about 38 skeleton soldiers - nevermind all the other types of units? I do, which is why for less than 2 quid I snapped this up. Many have dismissed it compared to the original TA but the music, effects and gameplay of TA : Kingdoms are something etched in my mind to this day. Time to see if they've tweaked it nicely for Windows 7.
DRM FREE!! Oh but sorry you don't get another 4 games that you'll never play along with this so will probably get about 11 degrees for that.