Its not a good idea to leave it switched on all the time, It does not prevent issues, but only masks them (i can tel you countless stories of swtching large complexes off, and the thing failing to boot as a whole because it was bascially knackered)
There VERY good reasons you need to turn off PCs. but the main one is memory leakage All memory needs to be relased back to the system (only happens fully at power down)
Its also the only time the AV programe can examine ALL files (some are locked and cant be accessed shortly after boot up)
Life is not so short that you can wait for a PC to boot fromn cold. (and if it takes a long time, its only then you realise you have choked the thing to death with too much rubbish)
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