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Glossary of computer terms:     webopedia.com
Webopidia is a very good site for basic and not so basic computer terminology.  Within the definitions, words are linked to their definitions if you don't know what they mean.  http://www.webopedia.com/

Computer Troubleshooting:     
Microsoft Product Support Services
This is for those who would like to get a little more in depth with their computer.  It has some good information, but it is from Microsoft so ...  http://search.support.microsoft.com/kb/c.asp?fr=0&SD=GN&LN=EN-US