Is it really necessary to keep Windows 7 updated?

May 30, 2014 at 11:29PM:

When we buy a new PC, we automatically get the ‘Security updates’ setting on, but is keeping Windows 7 worth? I have been advised by the computer shop-owner that updates do nothing more than just slowing down your PC. I don’t think that I would get hacked, when I have a paid and genuine Quick Heal subscription.

Please tell me that I should keep the PC updated or it is not necessary?

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