Typically that means you have no active antivirus. If you click the box that says that it should show what the problem is. Alternatively, if you do have active antivirus and are still seeing it, you may have a virus. If you have have a paid subscription to an antivirus program and it expires, you may see this message also.
What antivirus program do you have installed?
Telus provides it's own anti-virus software backed by Norton.
You may download it at www.telus.com/cloudandsecurity
You'll need to have an account on the Telus website first, you can register at www.telus.com/youraccount
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For more assistance, you may contact us at www.telus.com/chat