Cant Increment the Counter Registry Key for Setup in SQL Server 2005 (missing registry)

Hi im trying to install Sql Server 2005 but it says i need to Increment the Counter Registry Key for Setup in SQL Server 2005 before doing so.

Im following the guide at http://msdn2.microsoft.com/en-us/library/ms143215.aspx but in my registry the folder

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Perflib

doesnt contain any keys

"Last Counter"=dword:00000ed4 (5276)
"LastHelp"=dword:00000ed5 (5277)

or any key for that matter.

How can i fix this?

Two things if this is your development box make sure your files are saved and run system restore it is a clean way to remove problems in your system, if this is a company server tell the system team in charge of that server you need the registry fixed because at a bank I worked they had an enterprise wide registry cleaning software. Hope this helps.