When I reinstall QQ, there is a problem like:
“application has failed to start because its side-by-side configuration is incorrect. Please see the application event log or use the command-line sxstrace.exe tool for more detail.”
refer to http://www.sevenforums.com/general-discussion/19958-qq-x_x-side-side-config.html
then download:
http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=14431
OK!