First of all let me thank Scissorman (https://steamproxy.net/profiles/76561198027713442) for the first solution and ThatsMeTyler (https://steamproxy.net/profiles/76561198006743284/) for the second one.

I hope this guide will help you to make the game run.
Let me know in the comment section if this guide solved your problem.
Have fun!

To solve it, follow these steps:

1) Uninstall the game
2) In the windows search bar, type "regedit" and run it

3) Find the registry entry of Obscure 2, located in: HKEY_CURRENT_USER\Software\MRS\Obscure2

4) Delete the "MRS" folder and close regedit








5) Re-install the game and launch it

If an antivirus like McAfee tells you there's a virus in the game launcher (the .exe file) of Obscure 2, just put it in the exceptions or exclusions list, so It won't be detected during scansions.

Here's a list of guides to do it with your antivirus:

- McAfee: http://smallbusiness.chron.com/add-exceptions-mcafee-69566.html
- Kaspersky: https://support.kaspersky.com/2695
- Windows Defender: https://www.windowscentral.com/how-exclude-files-and-folders-windows-defender-antivirus-scans
- Avast: http://www.getavast.net/support/managing-exceptions
- Norton : http://smallbusiness.chron.com/set-exclusions-norton-antivirus-61906.html

PS: Don't worry because there are no viruses hidden in the game's files, it's just an error! :)