These are the labs in the "IT Essentials I : PC Hardware and Software" class that CISCO offers. I'm working on getting the actual curriculum for the worksheets, but until then you could learn alot from doing these labs such as how to identify all of the parts inside of your computer, how to install them yourself, safety and many troubleshooting techniques.
http://www.freewebs.com/cokemusicreal/ITE1_v31_en_SLM.zip
http://www.freewebs.com/cokemusicreal/ITE1_v31_en_SLM.zip