Windows Support Alert are false adverts, possibly caused by an adware. You ought to never trust these kinds of alerts, nothing they state is true, unless the issue is entirely unconnected. If an ad-supported program is indeed responsible, expect adverts to be highly intrusive. An adware can normally be installed by accident, during free applications installation. You do not need to worry about the advertisements endangering your computer, and unless you dial the provided number, you will be fine. If you did call them, you would have to deal with competent con artists who would pretend to fix your computer, and then ask for an illogical amount of money. Permitting some suspicious tech-support remote access to your computer can turn out to be a very bad idea, so be cautious. You can be calm that this threat You don't need to be alarmed about the infection the ad is cautioning you about because it isn't real, and that your system is safe. If you want the advertisements to go away, all you need to do is terminate Windows Support Alert.
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