I hope this helps...
If you want to learn more about computers then you can go to a great educational website like Teach ICT because they have a whole bunch of FREE information about computers:
http://www.teach-ict.com/gcse/gcse_topics.html
http://www.teach-ict.com/technology_explained/whatis_home.html
If want to learn Microsoft Office, Windows, XP, etc. then here are a whole bunch of tutorials:
http://www.teach-ict.net/software/excel/excel.htm
http://www.baycongroup.com/excel2003/index.htm
http://www.fgcu.edu/support/office2000/
http://inpics.net/excel03.html
http://www.homeandlearn.co.uk/BC/BeginnersComputing.html
Top-Windows-Tutorials is great website for learning about Windows XP and Vista, how to protect your computer with antivirus and firewall, backing up your files and data, etc.
http://www.top-windows-tutorials.com/free-windows-xp-tutorials.html
Also go to YouTube because it would have a whole bunch of tutorials for Microsoft Office, Windows XP, etc.
This website has many tutorials for learning C++, Java, Visual Basic, HTML, etc.
http://www.programmingtutorials.com/cplusplus.aspx
Here is a website for learning about computer networks and computer troubleshooting:
http://www.networktutorials.info/tutorials.html
YouTube also has many tutorials for fixing and maintaining computers and setting up computer networks!
Good luck and I hope you will find this to be useful!