Portable USB games for school

hi,
I downloaded a portable version of half life and it's expansions (portable meaning it's running from a USB so I can play it w/o installing at work and school), no I found out you can do this to almost any game so I thought I would make a couple more but I don't know which games to use.... the games have to be able to run on weak computers, not be too big and not require additional CDs (like most old adventure games or C&C games). do you have suggestions?

+1

I'm not slacking, I learn computers and usually finish my work earlier than others, I don't want to be on facebook all the times. also because of the bad driving arrangements ( i live far from school) I have a lot of time on the computer in the library. Another thing that give me this time is that because I speak english better than the rest of the class (here in israel) I'm in a special "native speakers" group which means I have lots of window hours.
so stop being moaning bitches and be all "you have to learn more" because that doesn't answer my question, I know that was very mean but you don't know **** about my school so you think I'm just slacking.

@pr3thej: I plan on using a no-cd crack on the games but I will buy them, that's why I need old games that I can usually find cheap second hand or on the discount shelves.

btw I put visual C# on my DoK so i can do my homework not just at home, you call that slacking?

I'm sorry, I got pissed off. I hope you accept my apology.
I just hate people telling me I have to study more, especially since you don't even know where I'm coming from.