Virus, spyware, and other malicious software protection:

Microsoft Security Essentials:
AVG AntiVirus FREE 2014:
Avira Free Antivirus 2014:

Backup and sharing important files:

Dropbox Online Backup (2 gb):
Microsoft SkyDrive (7 gb):
Google Drive (5 gb):

PDF viewing and creation:
Primo PDF: Cute PDF Writer:
Foxit Reader:
Adobe Reader 11:

Thunderbird E-mail Client:
Google Gmail:

Office Suite:
LibreOffice (OpenOffice spinoff):
KingSoft Free Office Suite:
Google Documents:

Genealogy Software:
Rootsmagic Essentials:

Legacy Family Tree:

Image editors:
GNU Image Manipulation Program (GIMP):
Picasa 3.9:

Miscellaneous utilities:
*Firefox Web Browser:
CCleaner: (Removes unused files from your system.)

File Hippo Update Checker:
Google Earth:
LastPass username and password organizer:

Note: These programs work with Windows XP, Vista, 7 or 8. Many also have Apple or Android apps.