system
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I did a search online for you and found this article which has an explanation down at the bottom about why you should shut down your computer regularly.
There’s also the risk if you leave it on all the time of a fire, or of someone or something accessing it without your knowledge when you’re not around to keep an eye on it - even if you have a firewall that risk is there and you need to be around to put a stop to any inimical activity. And you’re using up a lot of electricity, you might find a reduction in your electricity bill if you switch it off overnight.
I’d suggest try switching it off at the end of the day using the Start-Shutdown procedure, and see if that calms the VRDB generator down. It seems to be taking an awful lot of time to do its job, mine doesn’t take anything like that and I have 300,000-400,000 files on my system which is also one of the newer computers with a large hard drive.
http://www.naplestech.com/pages/maintenance.htm
In any case, what applications are you needing to run 24 hours a day 365 days a year? And I can’t think of anything which would use up 100% of a CPU:) most programs need some resources free to run.