Quote:
When you start MSN Messenger you cannot sign in, and you get the message:
Sorry, we were unable to sign you in to the MSN Messenger at this time. Please try again later.
To let us try and troubleshoot the problem, click the Troubleshoot button.
80048820
Fix this error / possible solutionThis error seems to indicate a problem with MSN Messenger's encryption routines.
The usual cause is that the time on your computer is not correct.
To correct the time on your computer, double-click the clock in the bottom right of your screen, in the window that appears you should check both the time and date.
If you use Windows XP, you can automatically correct the time by clicking the "Internet Time" tab, next click the "Update Now" button.
If you still have problems connecting with the time adjusted, try to run this file. This will make sure MSN Messenger can find all the files it needs on your computer.
中文大概意思:当你的MSN 无法登录，且提示错误代码为80048820，这种问题一般是由于你的系统时间不对，先校准系统时间，如果仍然无法登录，可能是由于DLL文件注册信息丢失，下载这个批处理文件
http://www.msn-problems.com/downloads/register-messenger-dll-files.bat 运行一下，问题应该可以解决.
近期反应无法下载批处理文件的比较多,特放到本地供大家下载:
点击下载此文件注:如果你的系统时间无法同步的话,请使用这个
软件来同步时间
时间同步程序 1.0.0.1（http://www.onlinedown.net/soft/23218.htm）据小道消息说这几天MSN及HOTMAIL无法登陆是因为被屏掉了，所以如果有能力的话，请寻找国外的代理服务器即可正常使用。
此处给大家留一个代理服务器列表页：
http://www.proxy4free.com/page1.htmlWENDY网友提出这个解决办法：Quote:
我最近也遇到了80048820问题，我按照这里说的所有方法都试过，都不成功。但是我在留言里看到有位朋友提到，新帐户可以登陆，我试了试真的可以，于是我把老账户里的C:\Documents and Settings\你的账户名\Application Data下的所有文件夹和文件都删除，问题解决。
其实不需要删除那么多，在其下面有一个目录：Microsfot\MSN Messenger\下保存的就是MSN的资料，各位网友可以试试把这个目录删除看看能否登陆，如果不行的话，再动手删除Microsoft，再不行的话，再按这位网友的办法试试，感谢Wendy网友！