Jim, There are two expsnsion slots, for two types of newer grahics cards, one slot is multipurpose, can accept graphics & other card types. Plays dvds glitch free... W7 must be microsoft telephone activated, first says not genuine, but proved so. Need a port adapter cord to show hdmi. Sound and other systems a-ok. Will ebcumber auto W7 ongoing online fixes. But OS is ok.. Jay Ps memory exansion slots are on board too, abd components work good.