Uno
I found 2 good free Uno Games. They install quickly but take up little space and are safe from spyware. One is what's called donation ware or as
one guy called it beer ware The game developers sometimes ask for donations to help them make new games or to buy a beer. These are usually college kids.
The first game called Get Uno was probably made for slower computers. I turned the animation all the way down and it still went really fast. Luckily all the moves are listed in a panel on the right side. It also installed so fast I thought it didn't work. It didn't automatically launch, but it did put a short cut on my desktop.

The second program acts more like you might expect. It plays smoothly and it pretty easy to catch on to. Now I have played several uno games on my PDA and they don't require you to yell UNO. This program does however. When you get down to one card, Just click on the "Call Uno" words in the middle of the game board. If you don't, the computer will give you 2 more cards. They also include the option of challenging a Wild Draw 4 card play.. one of the computer players did it quite a lot while I was playing. He usually lost the challenge and had to draw two more cards.

There are some options you can change in both games.
Download