When you see a file whose icon is just like an envelop and it is created in almost every folder. you should make sure that your system is infected with virus. today I will tell you the whole manual process how to remove it.
1- Restart your computer in safe mood
2- Search the files with the extention .eml click start and then click at search type .eml only in the search box and select all drivers for it then search and delete all the files.
3- type regedit in RUN and then OK.Press Ctrl + F and type runouse then find it and delete all the entries which showed up.
restart your computer and it's been removed.