Google has added a new feature to its search engine – it can now detect if your PC is infected with malware. It’s a clever bit of code that just quietly watches for unusual activity.
At the moment it only detects one strain of malware, but since it’s transparent and non intrusive it’s a good thing. Also, this is only relevant to Windows.
So if you see this message, your PC is probably infected with malware. Google suggests some steps to remove it, and you should really buy and install an antivirus program to prevent further problems.