Why can't I download Yahoo messenger?

Why cant I download yahoo messenger 11?

• I had once downloaded yahoo messenger 11. But after some days i uninstalled it. after a few days i again tried to reinstall. It was completed 40 %. But for some problem the computer got off. After that whenever i try to download it, it is downloaded 100%. then a dialog box comes saying "THE PUBLISHER COULD NOT BE VERIFIED. ARE YOU SURE YOU WANT TO RUN THIS SOFTWARE?" When i click 'run' , the dialog boxes are closed and after that happens nothing. Can anyone please suggest me how i can download it successfully....

• Answer:

  ANY Yahoo! Messenger program will not install properly if a former program, or an incomplete install, has not been completely deleted from the computer first. (Don't worry - your Contacts List will be saved into the fresh installation of an updated Messenger!) Use the Control Panel > Add/Remove Programs method, then double-check by going to Start > Search > files and folders > Yahoo! Messenger (notice the exclamation mark in the title). Write down the file path and delete all references manually if necessary. Delete all Yahoo Messenger references from the registry. You can use the safe registry editor in the CCleaner program for this too, or the forced uninstall in Revo Uninstaller if it shows in the Add/Remove programs list in the Control Panel. *(Read the instructions first!)* The uninstaller works well for Vista and Win 7, but not for XP - it leaves behind MANY junk files when uninstalling. Download and SAVE the program directly from the File Hippo web site. Install it only AFTER completely cleaning the registry of remnants. Download the most recent version of any Yahoo Instant Messenger (highest number, top of its list) You must be operating as an Administrator to install the program. Some firewalls have issues with installing Messenger from the Yahoo installer site, but disabling your firewall while online is VERY dangerous! Usually, by installing after downloading, the firewall will ask for permission to run the program. If you use Internet Explorer 8 or 9 as your browser, Yahoo Messenger 10 or 11 will not work properly without updated Flash and Java programs also installed, and possibly the .NET framework update. If you install from the Yahoo site without deleting your other program, you may get a 'missing .dll files' warning. See this Yahoo Knowledge Base article for that: http://help.yahoo.com/kb/index?locale=en_US&y=PROD_MSNG&page=content&id=DOC209