Silverlight Tools를 설치하다 오류를 만났을 때

당황하지 마시고 Dullard의 포스트의 내용을 참고하시면 됩니다.
에러코드에 따른 해결 방법이 정리된 표를 제공하고 있습니다.
(실버라이트2, 실버라이트3 관계없이 유효합니다.)

Error Code	Error Message	Cause	Fix
0x80070643	PerformOperation on exe returned exit code 1603	A newer version of the developer runtime is already installed	Manually uninstall “Microsoft Silverlight” from Add/Remove Programs and run the installer again 2009/12/22 Updated: 정호님의 제보해 주신 방법입니다. 위와 같이 해도 안 될 때는 Mircosoft Silverlight 3 SDK도 같이 삭제 하셨다가 재설치 하면 잘 된다고 합니다.
0x80070666	Another version of this product is already installed. Installation of this version cannot continue. To configure or remove the existing version of this product, use Add/Remove Programs on the Control Panel.	The installer failed to uninstall a previous version of the tools package	Manually uninstall "Microsoft Silverlight Tools for Visual Studio 2008" from Add/Remove Programs and run the installer again
0x80070671	Update removal was disallowed by policy.	The installer failed to uninstall a previous version of the Visual Studio patch	Manually uninstall Silverlight Tools patches (KB967143 or KB956453) applied to Microsoft Visual Studio 2008 under Installed Updates
0x80072EE5	WinHttpConnect failed with error: 12005	The developer runtime failed to download because there is no internet connection	For SL2: Save Silverlight.2.0_Developer.exe to the “%TEMP%/Silverlight Tools RTW” folder and run the installer again For SL3: Save Silverlight.3.0_Developer.exe to the “%TEMP%/Silverlight 3.0 Tools Beta 1 folder” and run the installer again
0x80091007	The hash value is not correct.	The developer runtime failed to download correctly	For SL2: Save Silverlight.2.0_Developer.exe to the “%TEMP%/Silverlight Tools RTW” folder and run the installer again For SL3: Save Silverlight.3.0_Developer.exe to the “%TEMP%/Silverlight 3.0 Tools Beta 1 folder” and run the installer again
0x80072EF1	Installation failed with error code: (0x80072EF1)	Local admin account does not have proxy access and the developer runtime failed to download	For SL2: Save Silverlight.2.0_Developer.exe to the “%TEMP%/Silverlight Tools RTW” folder and run the installer again For SL3: Save Silverlight.3.0_Developer.exe to the “%TEMP%/Silverlight 3.0 Tools Beta 1 folder” and run the installer again
1 in WebPI	Incompatible process running, unable to complete install	Visual Studio or a web browser was open during installation	Close Visual Studio, Visual Web Developer Express, Internet Explorer, and Firefox and run the installer again
1603 in WebPI	PerformOperation on exe returned exit code 1603	A newer version of the developer runtime is already installed	Manually uninstall “Microsoft Silverlight” from Add/Remove Programs and run the installer again
12005 in WebPI	WinHttpConnect failed with error: 12005	The developer runtime failed to download because there is no internet connection	For SL2: Manually save Silverlight.2.0_Developer.exe to the “%TEMP%/Silverlight Tools RTW” folder and run the installer again For SL3: Manually save Silverlight.3.0_Developer.exe to the “%TEMP%/Silverlight 3.0 Tools Beta 1 folder” and run the installer again