In my evironment re-installing everytime i ran into a problem would take much longer. For example: My moms computer is always getting screwed up because she is not very computer literate. It's down to a fix every two weeks now, so if i re-installed every time it would be a lot longer. Back ups, formate, re-install, restore all her stuff. I have only ever had to re-install on her computer once, and that was because the first time i fixed a problem it came back. That was the only time the problem came back after i fixed it.