Hello, for some bad anti-virus like Windows defender and some other small free ones it gives false detection that igc/dll contains virus/Trojan! This is FALSE, all files are clean and dont have any virus/Trojans on them!
I would suggest not to use windows defender as its really week antivirus and your computer might be at risk!
You can use any other free anti virus like AVG download here
To play game again,
1. Disable windows defender anti virus
2. Or add igc.dll file to exceptions
3. Download patch from HERE And extract over globalmu client!
Enjoy the game!