1 Most folks might not help ya unless you post your full system specs- mobo cpu mem etc etc.
2 You should install as admin but should only use compat modes if you have problems.
3 That vid card should be fine for most games- has no physx support but not really needed either.
4 Some games or patches may not care to install right- you may have to open and go into and double click the setup exe and install or move patches etc off of your c: drive to say a e: drive or burn them to disc and install from your opti drive.
Some folks say it is best to install games to another folder or make another on c: what ever- I let my games install to default folders and they all run fine..
You should try normal installs first- only do other things if you have problems- common sense stuff..
If using a lap top that in its self will be the most of your gaming problems..