I need help getting rid of EasyCalendar

[I need halp]

It was installed on my system as a result of downloading something else, and I cannot remove it. I've tried following many guides - it can't be removed from Chrome in the extensions tab, it has been deleted from 'uninstall or change a program' and when I delete its folder in my documents it just re-appears. Any help would be appreciated.

[OS = Windows 7 (added by moderator]

 

[hang-the-9]

Install and update Malwarebytes, reboot in Safe Mode and run Malwarebytes to see if it will remove it.

 

[I need halp]

Install and update Malwarebytes, reboot in Safe Mode and run Malwarebytes to see if it will remove it.

Tried it; it detects and removes it then it reappears straight after.

 

[hang-the-9]

Run Malwarebytes, run system cleanup and remove all temp files, do a system restore to a date before the infection.