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Also, when using compressed air, some have a tendency to see how fast they can spin the fan. Bad move. The bearings are only designed for a certain speed. Exceeding it can destroy your fan!

Last month I spent a couple of days troubleshooting a notebook that was “slow”. In fact it was so slow that it took 7 hours to download AVG. After spelunking around a bit, I found that windows update was hogging the system. So I disabled automatic updates, and enable notify only, and re-booted.
The machine ran great – 10mb download speeds.
Then allowed windows update to run. There was an update it thought it needed for Windows live essentials – so it would download the update, then attempt to apply. The update was not applciable to the version of windows live on the system, so it would undo the update, remove the downloaded software – and then start the cycle all over again!