i have a pc with vista ultimate 64bit, I7 prossesor 2.7ghz, 6gb of ram, ati hd 4870 x2 (2gb) and gigabyte mother board the only one that supports the i7 i forgot the model but any way i installed photoshop cs4 after uninstalling photoshop cs3 and i found cs4 realy laggy which means it has a delay and i tried opening 64 bit version and 32 bit version, no difference can any one help me its realy killing me and i tried small pics realy small same thing and btw i just got this pc so its new and clean