After uninstalling some applications, the vs.net IDE does not come, prompt Msxml3.dll unregistered cloud cloud. The REPAIR is still not available after the VS.NET installation. Checked the Q306905 of MSDN Knowledge Base, saying that it is necessary to reinstall the vs.net, and the repair is not working, be uninstalling. Unwilling, run to the command line to run Regsvr32 c: /windows/system32/msxml3.dll. Actually. Maybe it doesn't matter if you don't need REPAIR.