Antivirus – Free
AVG: http://free.grisoft.com/doc/5390/us/frt/0?prd=aff
Avast: http://www.avast.com/eng/download-avast-home.html#DownloadAvastHomeEdition
Windows Cleanup – Newest version as of December 2007
http://www.stevengould.org/index.php?option=com_content&task=view&id=29&Itemid=72
Ccleaner (download link on right side of page)
http://www.filehippo.com/download_ccleaner/
Adaware – spyware removal
Firefox - alternative browser
Open Office – very similar to Microsoft Office, except it is free
Has same components: word processor, presentation tool
http://download.openoffice.org/