As Dave & Jose have said- Malware. Start up in Safe mode (tap F8 during
start up)with networking. Download the free Malwarebytes from http://www.malwarebytes.org, install, update and run a deep scan.
Once you have cleaned the system, update the programs that have known
vulnerabilities on your computer. Don't know which? Download the free
Secunia PSI program from Secunia Personal Desktop PSI. It will scan your
computer and provide direct links to update the vulnerable programs. It
eliminates having to go to each web site, once you figure which.
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