Windows 2003 R2 installation problems

I had to upgrade a server today from Win 2003 to Win 2003 R2, this should be a simple task however as with much IT this proved a no go 🙁

—————————
 Windows Server 2003 R2 Setup Wizard
—————————
 Setup cannot continue because this product disc is incompatible with the 
 service pack installed on this computer. To complete the installation 
 of Windows Server 2003 R2, you will need to insert the latest version of 
 Windows Server 2003 R2 Disc 2.
—————————
 OK
—————————

A quick google search however led me to;

http://blog.stealthpuppy.com/windows/windows-2003-r2-and-integrated-service-pack-2

where it was explained that a Windows 2003 Slipstreamed SP2 installation could cause problems with subsequent R2 installation, the solution is simple just modify the file “R2INTL.INF” in the \CMPNENTS\R2 directory like this;

change;

R2SPLevel = 1

to:

R2SPLevel = 2

and the installation will work without a problem.  Easy as pie (when you know what to do that is ;-))…