When installing SQL 2008 I keep getting the following error:

MSI Error: 25541 Error 25541.Failed to open XML file
C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONF IG\machine.config, system
error: -2147024786

I have tried the suggestions on the web about reinstalling MSXML3 to no
avail. I have uninstalled completely, cleared temp files and attempted
reinstall with the same error continuing to occur.