The support team for Microsoft Windows Vista reported that upgrading to Vista may cause bugs that will prevent you from playing Final Fantasy XI.

That's because a couple of PlayOnline Viewer bugs are affecting Final Fantasy XI:

• Install menu doesn't activate even when the install disk is in the drive. "Install Menu" for selecting program to install does not start. Instead, PlayOnline Viewer installation begins.
• PlayOnline Viewer doesn't start. After installing the PlayOnline Viewer, the application sometimes fails to launch and displays the message "PlayOnline Viewer cannot run under current operating system."

Because PlayOnline Viewer does not launch, Final Fantasy XI becomes unplayable. Even if the PlayOnline Viewer does launch, the support team said further operation is not guaranteed. Similar problems happen when previously confirmed PCs upgrade to Windows Vista.

The team is still working with Microsoft to fix the bugs but it will take time. "We anticipate our support of Microsoft Windows Vista to start after the official version goes on sale."