SQL Server 2008 R2 installation nightmare

I'm not a SQL Server specialist, i'm only a software developer. But i've been using SQL Server since version 7.

I have apps that use SQL Server, so i often need to install this DB on my customers machines.

Until SQL Server 2005 i had no issues ; i just installed , attach my DB and everything worked fine.

Some customers want upgrade to 2008 version and that's when the nightmare started.

It seems SQL Server 2008 has a lot of new 'security' restrictions and the fact is everytime i try to install it, it NEVER finishes the installation without problems.

Some errors i get include :

• 'Access denied' at the end of installation


• 'Error 1814' when trying to start the service


• Windows authentication not connecting

If i run the SQL Sever 2005 installation, it works fine as always.

Due to all these problems, can anyone point me to some advices to how really get a fluid and efficient install of SQL Server 2008 R2, just like 2005 worked ?

Thanks in advance !