System Tool is a rogue malware virus /spyware that infects typically through a fake website. It pretends to be anti-virus on your PC telling you that you have viruses and other issues and request that you purchase the software to fix the issues. If you are getting this warning, do not give System Tool your credit card information, it is a scam and a malware virus. It is best to shut your computer down until your computer is repaired to avoid the virus spreading.
Here is an example of what it looks like:
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