please help. last night i deleted a bunch of old programs that i had no use for anymore. i didnt turn off the computer and when i tried to use it today, it sounded like the harddrive was clicking. so i restarted the computer and it came back on and the clicking was still there. the "acer" screen appears and after bout a min the screen goes black with a white cursor in the upper-left corner. what can i do? please help