Such new games may require latest video, audio and more drivers as well as an updated DirectX. Such software may trip over firewalls, popup stoppers or even an antivirus on the install.
This is the fun of trying to run games on PCs.
So far, I haven't seen much progress in making this easier on the consumer.
im trying to load "no one lives forever 2 " but it says there is an "unknown" error, then after u click close... a big red circle with white/grey x in it says cannot load game... i have windows me, with a few 2ooo files loaded on it///