While installing SW 2011 I have encountered error 1933

I need you help please, while installing SW 2011 I encountered error 1933. I have Windows XP 32 bit Operating System and from MS support this is a Windows file protection error, I guess windows will not allow changing some .dll files. However, even after installing higher Internet Information Servers I still have the same problem. Can someone please help?
SolidWorks Installation Manager
Error 1933. This setup requires Internet Information Server 4.0 or
higher for configuring IIS Virtual Roots. Please make sure that you
have IIS 4.0 or higher.
If the installation fails, contact Technical Support.
If you continue, you may encounter further errors. If you contact
Technical Support, be prepared to provide the installation log files
available in this directory.
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