Having Oplata@qq_com inside the system causes to make many crucial components, files, application software and programs inaccessible. This may locked them up and ask for ransom while trying to accessing them. Actually, those are not any kind of paid service but all malicious hackers. This is the way to earn money. As you choose to pay money, they again locked your PC up and again ask for money. this is their business and you will never get rid of that by paying. This must be eradicated from PC either with manual method or automatic Oplata@qq_com removal tool given below.
http://www.pcinfectionremovalguide.net/download-spyhunter