Problem uninstalling SQL Server 2005

I have a problem with SQL Server 2005.

I have a Computer with Windows 7 x64 bits installed and I want to run SQL Server 2005 correctly. The first time I try it, i did the follow:

1) Install SQL Server 2005 2) Install SQL Server 2005 Service Pack 3 x64

And it works!

But now (for reasons that are irrellevant) I need to uninstall all and re-install again to check the steps.

So I went to开发者_C百科 Add/remove programs of Windows and uninstall all the SQL Server things that I found. After, I did the same steps that I said before, but... it didnt work! What's going on?

I saw that the uninstall of SQL Server 2005 seems that it didnt go well because i can find the instance of SQLExpress... and i read that Service Pack of SQL Server cant uninstall.

But... how can remove ALL SQL Server 2005 things, to start again the installation like i did the first time?

Thanks

If you want to know how to remove the instance you can see here how to do it manually. Another resources is here and here.