If your computer is new, you should check with the manufacturer as it is
still under warranty.
While we can't diagnose based on what you've posted, the symptom described
is often the result of some virus or malware that has gotten lose on the
system.
Be sure your antivirus software is up to date and run a scan on your system.
Also, download, install and run Ad Aware: www.lavasoftusa.com
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