Get rid of unwanted programs
Speed increases don’t end with startup times. You’ll want to make sure that your computer is running fast when you’re using it, too. Free up storage space and memory by uninstalling programs that you don’t use. These may include trial versions of software that came with the computer when you bought it, out-of-date antivirus programs, old software or games that you no longer play. Click Start > Control Panel > Uninstall a program. From the list of programs that appears, click the program you want to uninstall, then click Uninstall.
Remove temporary files
Windows’ Disk Clean-up utility can help boost your computer’s performance by removing temporary files and unnecessary system files: Click Start. In the search box, type disk clean up and, from the list of results that appears, click Disk Clean-up. In the list of Drives, click the hard disk drive that you want to clean. For most people this will be the C: drive. Click OK. the Disk Clean-up box, select the type of files that you want to delete and then click OK and then click Delete files.