推荐回答（4个）
你说的文件有备份 是指什么 聊天记录文件？ 那么是如何备份的 如果在qq消息管理器中导出的 那直接找到备份文件再导入即可 导出的文件一般后缀是 .bak 文件名看你当时保存时怎么命名的了
如果找不到 可全盘搜索后缀为.bak的文件 然后根据日期及文件名判断一下
另外 不知你说的备份在哪里 如果在原系统 我的文档 或C盘某个文件夹中 那随着系统的重装此备份文件已经不存在了 存在其它盘的 找到它导入即可
一般个人使用恢复软件恢复的效果可能不会太理想 网上能找到的恢复软件功能有限 有的恢复软件即使找到并恢复文件 但数据是否被完全恢复及能否使用还是个未知数 如果觉得很重要 还是找较专业人员或公司来做吧 但很难保证你的个人隐私不被泄露（整个电脑中的 而不只是聊天记录） 自己衡量是否有必要如此做
如果备份文件是直接把MsgEx.db （聊天记录文件）拷贝到其它地方的 那找到此文件 把它放到qq安装目录你的Q号下的文件夹即可 （注意qq版本 最好安装的跟原来版本一样 ） 一般默认是在c:\Program Files\Tencent\QQ\xxxxxxxxx(你的Q号) 目录名称可能随着版本而有所不同 但找到qq号命名的目录就行了
如果之前的QQ文件夹不是C盘的话，打开原来安装QQ的文件夹 然后找到关于聊天记录的那个文件夹, 聊天记录文件保存在你的QQ号\msgex.db
把聊天记录那个文件夹移动到你现在的QQ安装目录里 移动时候需要选择“替换” 然后就可以了
一般这个损坏后是很难恢复的，看一下消息记录，导出来，看一下能不能用其他软件转换格式打开。
如果是找回了msg2.0这个文件就好办了，直接替换现在的这个同样的文件，就行了。
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