Fail to install SQL Server Compact 4.0

When try to install SQL Server Compact 4.0 , and it shows:
Error 25541.Failed to open XML file C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\devenv.exe.config, system error: -2147024786


Solution:
1. Run "Regedit".
2. Find “HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\VisualStudio\10.0\Setup\VS".
3. Export "VS".
4. Delete "VS".
5. Install SQL Server Compact 4.0 .
6. Register "VS".