Download " Getright" using
www.google.com search
(we have used it it 99% good)
and install it .....may be it will help you in saving the download files....
about slowing ........
beforee doing close all applications
press ctrl+alt+del once and check for the performance tab
dont touch the keyboard and mouse
now your CPU should be using 2% approx (will be OK but not more if more bad)
and the PF usage should be approx 300 to 450 for Best performance mabe little more +50 will be OK but not more .(the lesser the PF usage the better the performance )
(so for getting the best performance in the system unistall all un wanted software's )
regards
let me know