Install SQL Server 2008 R Error 2908

yang mengalami masalah error seperti ini 

1---->The installer has encountered an unexpected error. The error code is 2908. Could not register component {DABDC208-7DD5-4A0A-B5E9-53C857F7802D}.

2---->The installer has encountered an unexpected error. The error code is 2908. Could not register component {A72EDA2D-14E7-40C7-BAA8-25961F369C5A}.

3---->The installer has encountered an unexpected error. The error code is 2908. Could not register component {4CC7BE4F-04E1-4302-95CD-C0C29B6598B9}.

4----> An error occurred during the installation of assembly 'Microsoft.SqlServer.GridControl,fileVersion="10.50.1600.1",version="10.0.0.00000",
culture="neutral",publicKeyToken="89845DCD8080CC91",processorArchitecture="x86"'. Please refer to Help and Support for more information. HRESULT: 0x8002802F.

ini sedikit solusinya

install  Microsoft .Net Framework 3.5 SP1 atau Microsoft .Net Framework 4.0 atau  4.5

trus jalankan program intaller sql server 2008 dengan user Administrator

atau

backup dahulu key regedit ini

--HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server 
--HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSSQLServer

trus hapus keys di regedit:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall 

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services