installed windows 7 x64 yesterday. installed avast for now. works flawlessly. still decided on which media player to use. the os includes 2 wmp - 32bit and 64bit. i installed the k lite codec pack in the morning - both 64 bit and the normal 32 bit mega pack, but uninstalled them later. not sure what to settle on. thinking whether i should get something like vlc instead. for now, im using the regular firefox as flash player doesn't come in 64bit yet. installed the latest nvidia drivers from the nvidia site and aero is running perfectly.