Here's a list of what I have and currently use and their uses: 1) Microsoft Security Essentials(Anti-Virus) 2) CCleaner(Cleaning program, removes junk.) 3) Malwarebytes(Anti-Virus, goes deeper than all the others) 4) Foxit PDF Reader(Better than Adobe PDF Reader by miles.) 5) Defraggler(De-fragmenting, optimizing disk space) 6) Winamp(For listening to music, also Internet Radio built-in) 7)Free Download Manager(Are your downloads timing out? Try this.) 8) WinRAR(A good .rar and .zip extracting program. Also an internet meme) 9) Paint.NET(It's like a mini photoshop) 10) Recuva(For recovering deleted files on your HDD or SD card.) What are some of your must-have software on your PC?