hi, which conversion you did caused this problem? Maybe you can try to use Media Player to play the file. If it stop at 99% when playing, well, it must be the problem of the file itself, please download some fixer to correct the file, you can refer to http://www.videohelp.com for some help.
By the way, the new version beta2 is available now which can be got from its web http://www.
winavi.com