Spybot Search & destroy 1.6.2 (Free Download) at:

Download Spybot Now! 

AVG Antivirus 9.0 (Free Download) at:

Download AVG Now!

Avast Anti-Virus Home Edition (Free Download) at:

Download Avast Now!

Best Free Overall Cleaning utility: 

CCleaner (Free Download) at: 

Download CCleaner Now! 

Best for Photo Editing & Management: 

Picasa v3.6 from Google (Free Download) at:

Download Picasa Now!