for a very comprehensive speed up i do the following
# delete all unused or unwanted programs in the control panel
# run a free version of avast then a free version of ccleaner
# download driverpack and update all your drivers they also do a17gb offline version
# goto blackviper.com and using his guide stop all the services you dont want
# defrag the pc
# if after all of that your pc is still running bad you need a new pc or a new HDD