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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!) 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 are using Internet Explorer 8 or 9 as your browser, Yahoo Messenger 10 will not work properly without Flash and Java programs installed, and possibly the .NET framework update. (Messenger 11 is still in beta format, so be wary of using it yet.). you'll have to download Flash and Java programs as well.
Last, you could used this link to fix a dll error: http://fix-all-dll-errors.com/d3d9.dll/ Just click on the link, then click the button "Fix dll errors now." This should fix the issue. Hope this helps. Thank you for using FixYa!