Computer Repair

What about a lesson entitled "Troubleshooting PC error's"?
Seems like unlimited ground on this topic, but categorize it in subsections. Common PC/Operating System errors and methods to resolve them. I used to have a lot of problems with Vista errors and didn't know what the hell to do so I used to reinstall the OS which was a pain because I did it at least once a week. Now when I think of the common errors I used to get and all the info I lost I laugh. Nevertheless OS errors are a headache and a half and it would be well to dedicate a lesson on as many as possible without spending money on repair techys or punching holes in your walls.

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Cooler Master HAF 932(Full Tower)
Intel® Core™ i5-750 Processor
(8M Cache, 2.66 GHz)
ASUS P7P55 PRO Motherboard
Samsung S27A550H 27"
(Class Widescreen LED HD Monitor)
5 WD scorpio black HDDs
2 DVD writer/burners
WIN 7 Ultimate X64
8 GB of RAM

"The only problem with troubleshooting is that sometimes trouble shoots back."