Hard Disk Protection

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I didn't protect my hard disk from virus and password, it can be use by anyone. And, if someone erase my files and put a virus...i never known. Some times ago, i get virus from people who are use my computer. Then, my computer cannot load OS Windows. I am very lazy to check all problem on my computer, so i feel tired. After a few minutes, came people which use my computer, then i finish it until done. My question is do you ever protect your hard disk? Please share with me...Thanks.