梦的忧伤

从网上下载一个ghost32 想把原来做的系统备份还原（原来的系统备份是在DOS下做的),按照提示点下去，在最后出现了问题，见截图。英文提示如下：
( A destion volume could not be locked as it is in use by another process.Do you wish to attempt to force a dismount on the volume ?
All open handle to this volume would then beinvalid )