I downloaded Python 3.0.1 and installed on Vista. I opened IDLE and it
worked fine. I went into the Preferences to change the keybindings on
the history scrollers. I changed history-next to Ctrl+Down Arrow,
though when I pressed OK it listed only Control as the binding. I then
tried to change history-prev to Ctrl+Up Arrow, but when I pressed OK,
it gave an error that that binding was already taken. The program then
crashed. Since then whenever I try to open IDLE, the pythonw.exe
process appears in my Task Manager briefly, but then it exits, and I
never see any other evidence the program has opened. The command line
still works fine. I tried repairing the installation, uninstalling,
restarting the computer, and removing the leftover registry keys for a
completely clean install, but nothing has worked to be able to reopen
the program.