I registered yesterday and played for a while although I was alone in the server, but today when I click 'connect' it pop up an error saying "Unable to execute" - the game just won't run. Any ideas?
Make sure the compatibility mode of gtavc.exe and vcmp.exe are the same, and also re-set the Vice City Installation Location in Tools > Settings to the file where you've got the game installed.
If the error still occurres after you did these two things, it's will be a riddle for me.
PS. You are one unlucky bastard with your VCMP.