games wont run

I cant get my halo 2 to work. It says I need a windows vista or 2003 os in order to play and I have freaken vista home prem. It started when I didnt have my os activated yet so I started the update on the disk and entered the actiavation key and this happens. This never happened to me before. Can someone please help. I cant even uninstall it.

edit: when I start from the disk i get this error code.0xc0150002

does anyone know how to fix this problem?