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.

CCleaner:  is the number-one tool for cleaning your Windows PC. Keep your privacy online and offline, and make your computer faster and more secure. Easy to use and a small, fast download.

Avira: The downside to the internet has been the amount of malicious content wriggling around, hell bent on destroying your computer in some way, shape or form. Avira constantly and rapidly scans your computer for malicious programs such as viruses, trojans, backdoor programs, hoaxes, worms, dialers etc. Monitors every action executed by the user or the operating system and reacts promptly when a malicious program is detected. It works.

PrimoPDF: This program sets itself up as a printer. When you choose to print any document, simply select Primo instead of your paper printer, and voila! the file is created as a PDF. Of course it's free.