Using Win7 32-bit for 3months and didn't have problem with developing any .NET-based applications including ASP.NET apps.
Just upgraded my laptop's RAM 3days ago and switched to 64-bit version of Win7.
When I'm working on installing IIS7 and .NET Framework 3.5 SP1, there's an error about not all features were installed for some unknown reason.
When I try to register ASP.NET through aspnet_regiis -ir in c:\Windows\Microsft.NET\Framework64\v2.0.50727\, a dialog box shows with this error message: "Operation failed with 0x80070643" and after I close the dialog box, another error message on the console command shows with this message: "An error has occurred: 0x80004005 Unspecified error".

Thanks for the help.