There are few reasons which make your PC/Laptop slow:

- If you use internet, there are chances that your laptop is infacted by spyware. Install some antispyware.

- Don't install programs that run in the background unnecessaraliy. Configure your antivirus to scan files only when you copy something from internet or other disk. Files going out from your computer don't need to scan.

- If you frequenly install/uninstall or copy/delete files, your disk gets fregmentation. Do defregmentation every week.

Hope you don't need to spend money to someone to fix your laptop's slowness problems :)