电脑中了奇怪的病毒，请予以帮助，谢谢

症状：
    电脑能正常启动，但好像除了系统文件外的文件都加了个.enfp的扩展名，手动把这个扩展名去掉后文件已经损坏打不开了，文件夹目录下多了一个_readme.txt文件，内容如下：

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请教大神们如何清除病毒，如何恢复文件？谢谢

电脑中了勒索病毒了，你文件被加密了要你交钱才肯解除。。。

您好， 该勒索病毒暂时无法解密 请您随时关注 360勒索解密查询。https://lesuobingdu.360.cn/

请问在中毒前是否有安装并开启360安全卫士？

看起来不便宜