Depends on the servers that you're connecting to. If a server is hosted in the Uk and you're connecting from lets say Australia you're going to experience high ping. I can't really remember if L4D2 ha ...

Counter Strike 1.6 (good for lan lobbies in school)
Counter Strike Source
Counter Strike GO
Any Call of Duty below Black Ops 2
TF2
Half Life 2
Halo Combat Evolved (good for lan lobbies in scho ...

Post what GPU you have. It's hard to tell if we don't know.

My old toshiba laptop did this. You will probably need to reinstall your touchpad drivers. You can do this by searching this website http://support.toshiba.com/drivers
If that doesn't solve it then I ...

Do not get him the 1st two. They are chromebooks and wont run Minecraft or anything windows related. The last two will run minecraft but not very well.

Is that the highest resolution your monitor supports? if so you should definitely get a new one.
Also games wise check out the current Humble Bundle. It contains all of the Bioshock games

From the looks of it your GPU takes up the only two slots in the back. Damn alienware computers :/ You will have to get an external one instead.

For my PC I use 2 24" Samsung Monitors, and for playing games on my PS4 I have a 40" Sony Bravia 200Hz tv. I also have a 15 Meter HDMI cable to plug my PC in so I can game on my TV

If you still have your product key simply download the Windows 8 iso from the Microsoft website then burn it to a DVD or USB thumb drive. Then install, if you can't do that just stick with windows 7 t ...

Change the gpu to something like the GTX770. That bad boy will easily run arma 3 on decent settings

Yes it will play every game you throw at it. Just suggesting the upgrade to crank the graphics ...