I solved the problem by installing JDownloader after deleting my Hosts file during installation. However, I couldn't solve the problem of weird characters. I found a solution, I disabled the cache font service in services.msc, but I couldn't delete everything in the system files. On the other hand it has reset the Windows system icons, the font solution you are using does not allow to use a modified Windows theme. It does not matter, I uninstalled JDownloader.
