yeah, but that will only work if the installation is still running in atleast the background, but if he has re-booted then chances are it wont be so therefore it wouldnt help.

try that, but if nothing is there, erm delete the folder the programmes created and all contents and delete the file you downloaded to start the install aswell, cos if it isnt there at all, it cant install. if none of them work, let me know.