Requirements:

Supported operating systems: Windows Server 2000, Windows XP Home, Windows XP Pro, Windows XP MCE, Windows Server 2003, Windows Vista.

You must be running as an administrator or with administrator privileges.

You must have Yahoo Messenger installed.

Yahoo!ACE is intended for use with the latest Yahoo Messenger 9. Yahoo!ACE also works with earlier versions of Yahoo Mesenger but is not recommended. Unpredictable behavior may occur.

You must have Internet Explorer 6 or newer installed.

You must allow this program to access the internet through your firewall.

• Granting Access (McAfee)
• Allow on all ports (Norton)
• Exceptions (Windows Firewall)

Source : yahoo Ace

For Download Click Here

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If you have a problem with the software, try to complete its file system and registers the file system in the folder. you can get the system files here, register files for xp user click here, register files for vista user click here, unregister files click here. If you are still having problems with the program try to contact with the programmers to the website / forum where programmers follow.