Garry's Mod is working on the computer, had the hard drive wiped and my games reinstalled, i seen that flashlight and lamps don't work very well without the most recent Vista service pack and latest version of Direct X
Oh boy, that means i'm still unable to use it because i don't want to break anything by doing something incorrectly somehow

So yeah, in it's current state, flashlight's brightness is almost non-existent, to get lamps working, i need to spawn more than one lamp, the second one will be at normal brightness and spawning more won't make newer ones brighter and the flashlight will have it's normal brightness as well
Also there aren't dynamic shadows because of the current version of Direct X this computer starts with can't support that