Why will your computer not run Yahoo 10 with Windows 7? An instant I click on someone, Yahoo instantly crashes. You get same results with Yahoo 9.
Yahoo 8.1 works for messaging, but with video on a webcam you get an error message about incorrect character in program, frozen pictures, eventually your entire system crashes and requires a reboot. You have reinstalled your Yahoo messenger software.
Please download and install latest version of Adobe flash player. Also, download and install latest Java software. Hopefully, that will resolve your issue.
Make sure your only trying to install one version of messenger at a time on your system. Yahoo messenger 10 won't work without Adobe flash player or Java. Upgrading both flash player and Java is recommended to current versions if have both those installed already.