手動移除 db 方法1：
If you are running an x86 based edition use
msiexec /x {CEB5780F-1A70-44A9-850F-DE6C4F6AA8FB} CALLERID=ocsetup.exe
If you are running an x64 based edition use
msiexec /x {BDD79957-5801-4A2D-B09E-852E7FA64D01} CALLERID=ocsetup.exe
方法2（請先備份相關登錄檔）：
If you are running an x86 based edition use
"{CEB5780F-1A70-44A9-850F-DE6C4F6AA8FB}"
If you are running an x64 based edition use
"{BDD79957-5801-4A2D-B09E-852E7FA64D01}"
開啟 regedit，以上述字串尋找，將找到的字串其父階層的 mssql2005 刪除即可
例：
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server]