@Milkshanks It says a file is missing, so guiminer might have been installed into a folder with strict permissions, such as Program Files. He should try installing into a normal data folder, not a system folder.
On a side note, I'd appreciate if guiminer could be made to install in Program Files and the 'Programs and Features' Control Panel with a normal setup program, this is the only application I am running that does not conform to Windows requirements or guidelines.
O erro se deve a falta de um arquivo. Ele disse que você deve ter tentado instalar o guiminer em uma pasta com restrições de permissão, tipo "Arquivos de Programas". Basicamente ele falou pra voce tentar colocar o guiminer no desktop ou algum lugar do genero.