Windows 7 compatibility?

I recently bought Windows 7 retail version but havent installed it yet as i wanted to check if it will work with the games/programs i use in either 32bit or 64bit?

The second question is if i install W7 on my pc then upgrade in next few months some parts eg mainboard/cpu/memory can i transfer the licence or will it stil work?

Anyway these are the most used applications on my pc (most recent versions) atm.

Games:
Fallout 3 plus FOMM/GECK
Gears of War
Lost Planet
Street Fighter 4
Resident Evil 5
Dawn of War 2
and steam/gamesforwindows

Programs:
Kaspersky 2009
Vuze
Winamp
Photoshop
Firefox
Nero
Itunes
Stardock

Thanx in advance.

-Jay