hello everyone, pls I need help with my computer which is running way too slow. I have Acer aspire 5552-5498 with the following specs: phenom II X3 N830, 15.6", ATI MR HD4250, 4GB DDR3 memory, 640GB HHD, Window 7. it takes upto 4 minutes to open browser (window and internet). It couldn't load online stream, i can't play movie or music without frequent freezing. I have reinstalled it several times. I bought it second-hand. what can i do.