I've downloaded yahoo mesenger but can't get it started?

What is the error?

I've downloaded yahoo mesenger but can't get it started?
did you uninstall old messenger and forget 2 reboot.. did you update your anti virus and run scan before you downloaded messenger ? maybe have 2 uninstall it and try again following the path .. bummer eh
Reply:You could consider uninstalling your current Yahoo! Messenger and download from http://www.filehippo.com/download_yahoo_... The latest version is Yahoo! Messenger 8.0.0.716. You could also find a list of previous versions for you to choose.