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I would suggest you to scan your computer using the free version of anti-malware software. This will remove all of the malwares, spywares, viruses from the computer.
Note: If you have Anti-virus programs like Norton, McaFee, CA, kaspersky installed on the computer, still I suggest you to download and install Malwarebytes as the Anti-virus program does not remove Malwares generally.
Please open the following link and download free version of Malwarebytes.
http://www.filehippo.com/download_malwarebytes_anti_malware/Please click download the latest verion on the top right hand side and install it.After that, click Quick scan and click start.It will take around 10-15 minutes to scan. Once the scan is complete. You will see a link, "Select All". You will click "Select All". After that you will click "Remove Selected"Then you will see a pop up with options, Yes or No. Click Yes and this would restart your computer.