My computer all of a sudden stopped being able to properly read cd's and dvds. It still shows on My Computer but it says it has 0kb. Also if I plug in a usb flash drive it wont read it, I tried all the ports and it wont work. (no its not my flash drives that are broken). Also When I go to "my computer' the little loading symbol by the mouse keeps flickering. What is going on? Im on windows vista btw.