Once is more than enough. May I ask what the issue was? If you were not online, would the problem still have happened?
What does the speed of the CPU / FSB and that amount of RAM have to do with it? Is this a video system?
Yes, you may. The HD was developing bad sectors b/c of a cooling fan attached to it. It started 2/6 last year, but did not notice until July. Apparently the vibration from the fans caused drive issues. I replaced the drive and started happening again. Removed the fan and problem was gone.
To date, NEVER had a system burp due to any wifi/download/etc activity. In fact, the way I assign sound devices even keeps potential embarrassing moments from occurring.