Hi

I cannot install SQL 2008 SP1 (slipstream installation) on Windows 2008 R2.
When I click setup.exe it says

"Microsoft .Net Framework 3.5 SP1 installation has failed / SQL server 2008
Setup requires .Net framework 3.5 SP1 to be installed"

Application Server role is installed so .Net Framework 3.5 Feature is also
installed in Windows 2008 R2.

Do you have any idea why it keeps failing with this error message?

Regards
Javier