Why my yahoo messenger not work?

My friend tried downloading yahoo messenger and he said it didnt work. Does anyone know why it didnt work??

• My friend went and tried to download yahoo messenger on his laptop and he told me that it didnt work at all. Does anyone know why it isn't working for him? If you want to talk further about this and help me resolve this better, IM me on Yahoo! imdebestestgrleva I need to know why it isn't working and how he can get it to work for him. Please help me ASAP

• Answer:

  Some computers are very quirky about downloading Messenger using the Yahoo site's installer - who knows why. If any of the program is on the machine at all, future attempts will be unsuccessful until he cleans the registry of all mentions of Messenger (CCleaner should help for thi, or have him do a search for files and delete whatever was found) 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. Delete all Yahoo Messenger references from the registry. 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 and delete all references manually if necessary. The uninstaller works well for Vista and Win 7, but not for XP - it leaves behind MANY junk files when uninstalling. If you use Win XP, download CCleaner to help clean out the registry safely, but be sure to back up the registry first with the program. (It's also a handy program for deleting temp files, history, etc in one click - for a faster, cleaner computer) 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, 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 as your browser, Yahoo Messenger 10 will not work properly without Flash and Java programs also installed, and possibly the .NET framework update.