If you have a broadband connection, put yourself behing a router's firewall.
If you can afford 2 computers, have 1 as your internet computer and another as your business computer. Only connect the 2 when you are transferring files from your business computer to your internet computer. Never transfer files from your internet computer to your business computer.
If you don't need to leave your computer on, do not do it.
Restoring a hard drive = $600
Buying an internet computer = ~$600
It is worth the investment. (I'm trying not to sound like a broken record here)
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