Hi Gidsel, the most important thing to do when removing omiga-plus browser hijacker is to fix your Internet browsers shortcut targets. First step should be uninstalling the Wsys Control (in some cases WPM[random numbers]) application from your control panel. If you get an error when uninstalling this potentially unwanted application - you could try using third party tools to assist you in this task:

CCleaner
Download, install and run CCleaner. After launching the program select "Tools". In the uninstall programs list select the program you want to uninstall and click the "Run Uninstaller" button.

Revo Uninstaller
Download, install and run Revo Uninstaller. After launching the program select the program you want to uninstall from the list and click on the "uninstall" button.

IObit uninstaller
Download, install and run IObit Uninstaller. After launching the program select the program you want to uninstall from the list and click on the "uninstall" button.

Right after uninstalling this PUP fix your Internet browsers shortcut targets by following this removal guide - https://www.pcrisk.com/removal-guides/7418-omiga-plus-virus

After following these steps be sure to scan your computer with Malwarebytes Antimalware and SpyHunter - https://www.pcrisk.com/top-spyware-removers