Why system icons are gone?

I realized that some of my computer settings changed on its own..And I doubt that it was the doings of viruses...
But I've had Norton Internet Security (60 days free trial came along with HP dv3 2111 TX) as my laptop's protection.
Today some of the system icons I always see (volume,network,power) are gone...So I went to check out the properties of the task bar but I realized that the above items have been disabled and I cannot click it at all!(cannot be ticked). Am I infected with any spyware or what? Please help me!
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More about system icons gone
  1. Boot into safe mode with networking (f8 on startup). Download and update malwarebytes. Then run a full system scan.
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