He he he guys....u got it serious...na?
I think dis is da problem for closing when u hit ALT+F4
Try dis one
if this doesn't work it maybe because there are file clashes on ur computer
in order to correct this try going into find files or folders in ur start menu and typing in *.dll and/or *.ini and deleting all files u find with this extensions - they r not needed by computer and just cause file clashes durring ur l33t hax0r activities.
Now u have deleted those files try again
hope that helps