Well.......First stop the process of that virus from Task Manager. Remove the entry from startup. And boot into safe mode. Scan your PC with any good updated antivirus(AVG, Avira, Avast). Also scan your PC with Malwarebytes.
The root of iiiiiiii.exe is in the C:\WINDOWS\SYSTEM32\XP68809. Check this folder for any entry like this. If found Shift+Del it.