Sugiro que você faça o download do CCleaner e do Defraggler (ambos gratuitos)
CCleaner
CCleaner is a freeware system optimization, privacy and cleaning tool. It removes unused files from your system - allowing Windows to run faster and freeing up valuable hard disk space. It also cleans traces of your online activities such as your Internet history. Additionally it contains a fully featured registry cleaner. But the best part is that it's fast (normally taking less than a second to run) and contains NO Spyware or Adware! :)
Defraggler
Use Defraggler to defrag your entire hard drive, or individual files - unique in the industry. This compact and portable Windows application supports NTFS and FAT32 file systems.
Auslogics Disk Defrag
Disk Defrag is a vital maintenance tool that will improve your PC's performance by defragmenting and re-arranging files on your disk.
Ambos otimizam totalmente o seu computador, então você pode começar a pesquisar em programas, etc.