First, open “System Properties” > “Advanced”> “Startup and “Recovery”> “Setting”, and add /noguiboot to fastdect. By doing this, it does not display any scroll bar when starting your computer. But, if you really like the scroll bar, it is unnecessary for you to do this step.

Second, click “Start”> “Run”, type msconfig so you can open MSCONFIG. Then, click “start”. In the option, you may find it contains all the applications during operating Windows. Here, you can delete any application as long as you want because there is not any vital application for Windows. Besides, if your computer is still running slow, you may try to close system restore, hibernate support or automatic update. It may assist you in improving your computer speed.

Or defragment disk is a good choose, you should really have a try.